HIV self-testing and related factors in men who have sex with men in Shijiazhuang / 中华流行病学杂志

Objective: To understand HIV self-testing and related factors in men who have sex with men (MSM) in Shijiazhuang. Methods: From August to September 2020, convenient sampling was used to recruit MSM in Shijiazhuang. Online questionnaires were used to collect information about their demographic characteristics, sexual behaviors and HIV self-testing. logistic regression model was used to analyze the related factors associated with HIV self-testing. Results: In the 304 MSM respondents, 52.3% (159/304) had HIV self-testing in the past 6 months, and 95.0% (151/159) used fingertip blood HIV detection reagent. Self-purchase was the main way to obtain HIV testing reagents (45.9%, 73/159), followed by supply from MSM social organization (44.7%, 71/159). The reasons for having HIV self-testing were non-specific testing time (67.9%, 108/159) and privacy protection (62.9%,100/159), the reasons for having no HIV self-testing included inability of using (32.4%, 47/145), being unaware of HIV self-testing reagent (24.1%, 35/145), and worry about inaccurate self-testing results (19.3%, 28/145). Multivariate logistic regression analysis showed that being 18-29 years old (aOR=2.68, 95%CI: 1.20-5.94), obtaining free HIV self-testing kits in recent 6 months (aOR=8.61, 95%CI: 4.09-18.11) and making friends through Internet and social software (aOR=2.68, 95%CI: 1.48-4.88) were positive factors for having HIV self-testing. Conclusion: HIV self-testing is a more flexible and convenient way to detect HIV in MSM, and the promotion of HIV self-testing in MSM should be strengthened to further increase the HIV detection rate in this population.

Exploring age-related visual dysfunctions and strategies for visual function restoration / 中华实验眼科杂志

According to the international definition on the aging society, China has entered an aging population period.The research and strategies addressed on age-related health problems have become one of the key parts of the national strategy of Active Health.Age-related visual function decline and ocular diseases include presbyopia, cataract, age-related macular degeneration, glaucoma, diabetic retinopathy, etc.It is significant to engage the role of Active Eye Health Project in the research on related areas and in introducing appropriate scientific strategies to early intervene their occurrence and development.On the basis of prior research and practices conducted by other teams, this article analyzed age-related eye health problems as well as their serious impacts, and put forward the concept and specific strategies related to visual function decline and restoration.Additionally, combined with the preliminary practice of our team, the feasibility and the clinical significance of early intervention were investigated.

Advances in research of HIV transmission networks / 中华医学杂志(英文版)

Transmission network analysis is a crucial evaluation tool aiming to explore the characteristics of the human immunodeficiency virus epidemic, develop evidence-based prevention strategies, and contribute to various areas of human immunodeficiency virus/acquired immunodeficiency syndrome prevention and control. Over recent decades, transmission networks have made tremendous strides in terms of modes, methods, applications, and various other aspects. Transmission network methods, including social, sexual, and molecular transmission networks, have played a pivotal role. Each transmission network research method has its advantages, as well as its limitations. In this study, we established a systematic review of these aforementioned transmission networks with respect to their definitions, applications, limitations, recent progress, and synthetic applications.

National HIV/AIDS epidemic estimation and interpretation in China / 中华流行病学杂志

The number of people living with HIV/AIDS (PLHIV), new HIV infections, and deaths due to HIV in China were estimated. These data provided evidences for the analysis on current HIV/AIDS epidemic in China, development of AIDS prevention and control strategies and public health education. However, whether the estimation results could be fully used in practice depends on appropriate interpretation. Since the differences in estimation methods and data to produce the estimates for each year, it is not suitable to directly use the estimation results of different years to conclude the HIV/AIDS epidemic trends. The 2018 estimation results indicated that the number of PLHIV is already beyond one million by the end of 2018 and would keep growing, causing much pressure of for HIV/AIDS prevention and control. With the increased burden of case management, innovative strategies are needed to reduce secondary transmission of HIV and control the aggravating spread to general population. Less than 70%, which is significantly lower than the goal of China’s 13th Five-year Action plan for AIDS prevention and control. All local governments have the necessity of analyzing percentage of PLHIV who know their status, to conduct targeted strategies and measures for the improvement of HIV case finding. New HIV infection is the core indicator for HIV epidemic evaluation. The number of estimated new HIV infections is around 80 000 in 2018. It is necessary to further improve the strategy and increase the intensity to effectively reduce the new infection of HIV.

A meta analysis on atropine controlling myopia progression in children / 中华实验眼科杂志

Objective To examine the published evidence on the effectiveness of topical atropine for the prevention childhood myopia progression and the myopic rebound occurring after cessation of atropine.Methods A meta analysis,with a focus on randomized controlled trials (RCTs),was conducted by using the following electronic databases:PubMed,EMBASE,and Cohrane Library.The search strategy were ‘ myopia’ OR ‘ refractive error’ OR ‘ nearsighted’ AND ‘ atropine’ OR ‘ anti-muscarinic’ AND ‘ child’ OR ‘ children’ OR ‘ kids’ OR ‘ adolescent’.The last search was run on April 9,2019 and Jadad scoring system was used to evaluate the quality of each RCT.Results Eleven RCTs with 3 162 children aged 5-15 years and spherical equivalent ranging-0.50 to-6.75 D were included.Most of the studies found a beneficial effect in myopic control when treated with atropine compared with various control groups.The mean difference (MD) between the treatment and control groups in myopic progression were 0.95 D/year (95％ confidence interval [CI]:0.69-1.22),0.93 D/year (95％ CI:0.50-1.36),0.82 D/year (95％ CI:0.68-0.96),0.46 D/year (95％ CI:-0.02-0.94) for 1.0％,0.5％,0.1％ and 0.01％ topical atropine,respectively (P＜0.001).After 12 months of atropine cessation,the analysis indicated that the MD between the different dosage of atropine,used during the treatment period,and the control group was-0.36 D/year (95％ CI:-0.70--0.02,P=0.04,I2:98％).Conclusions Atropine is a potent option in myopic control.Even though,a myopic rebound was reported after treatment cessation,atropine-treated eyes have a slower myopia progression compare to controls.Low dosages of atropine (especially 0.01％) seem to have minimal rebound effect and few side effects.

Analysis on condom use negotiation with sex partners and condom use in female sex workers / 中华流行病学杂志

Objective@#To know condom use negotiation with clients and regular sex partners and condom use in female sex workers (FSWs), and provide reference for the development of comprehensive HIV/AIDS intervention for FSWs.@*Methods@#The cross sectional survey was conducted in Jianshui county and Mengzi county in Honghe Hani and Yi autonomous prefecture. A total of 476 FSWs aged 16 years and above were recruited from entertainment venues, and the information about their demographic characteristics, condom use negotiation and condom use were collected by using questionnaires. Logistic regression model was used to analyze related factors of condom use after negotiation between FSWs and clients unwilling use condom.@*Results@#A total of 852 FSWs who aged (24.29±8.44) years old participated in the survey. In past month, 499 FSWs had negotiation for condom use with unwilling clients (58.6%, 499/852), after negotiation, 441 FSWs (88.4%, 441/499) had consistent condom use in each sex with the clients. In the past one month, 99 FSWs had negotiation for unwilling use condom with regular sex partners (14.4%, 99/687), after negotiation, 54 FSWs (54.5%, 54/99) had consistent condom use in each sex with regular sex partners. Among the FSWs, 266 (53.3%, 266/499) reported that they could say "It is a mandatory requirement" to persuade clients who were unwilling to use condom. 97(19.4%, 97/499) reported that they could say "There is risk for infection" to persuade clients who were unwilling to use condoms. 115 (23.1%,115/499) reported that they could say "It is a mandatory requirement" and "there is risk for infection" to persuade their unwilling clients to use condoms. 21 (4.2%, 21/499) reported that they used other strategies. 22 (4.4%, 22/499) felt that it was difficult to persuade clients to use condoms. Multivariate logistic regression analysis showed that compared with FSWs who felt difficult in persuading clients to use condoms, FSWs who felt moderate difficulty were more likely to have consistent condom use after negotiation (OR=4.00, 95%CI: 1.55-10.32) and FSWs who felt easy in persuading clients to use condoms were also more likely to have consistent condom use (OR=30.17, 95%CI: 3.22-282.44). Compared with FSWs used other strategies to persuade their clients to use condoms, FSWs who said it was a mandatory requirement were more likely to have consistent condom use after negotiation (OR=4.44, 95%CI: 1.41-14.01) and FSWs who said it was a mandatory requirement and there was risk for infection were also more likely to have consistent condom use (OR=5.52, 95%CI: 1.55-19.73).@*Conclusions@#Negotiation for condom use increased the rate of condom use in FSWs in sex with clients who were unwilling to use condom. The negotiation strategy of "It is a mandatory requirement" would promote condom use in FSWs in sex with clients who were unwilling to use condom. Besides, the negotiation strategy of saying "there is risk for infection" had additional effects.

New psychoactive substances abuse among patients with access to methadone maintenance treatment in Jiangsu province: a case-control study / 中华流行病学杂志

Objective To explore the reasons and factors associated with new psychoactive substances abuse among patients with access to methadone maintenance treatment (MMT).Methods A well-developed questionnaire and urine tests were used to collect information about demographic characteristics,condition of MMT and drug abuse,family and social support of MMT clients.A 1 ∶ 1 matched case-control study was conducted,and conditional logistic regression model was used to identify factors associated with new psychoactive substances abuse.Results A total of 212 (106 pairs) clients receiving MMT were recruited,and most of them were males (78.3％,166/212),married or cohabitant (48.6％,103/212) and unemployed (63.2％,134/212).The average age of the clients was (45.1 ± 7.2) years.The main types of abused new psychoactive substances were benzodiazepine (62.3％,66/106) and methamphetamine (39.6％,42/106).The proportion of abusing multi new psychoactive substances was 8.5％ (9/106).Results from multivariate conditional logistic regression analysis indicated that using opioid drug during the past 6 months of MMT treatment might increase the risk of abusing new psychoactive substances (OR=3.25,95％CI:1.35-7.79),benzodiazepine (OR=3.25,95％CI:1.11-9.47) and methamphetamine (OR =13.31,95 ％ CI:1.12-158.01).Moreover,MMT for more than 9 years reduced the risk of abuse of new psychoactive substances (OR=0.03,95％ CI:0.01-0.21),benzodiazepine (OR=0.02,95％ CI:0.00-0.36) and methamphetamine (OR=0.02,95％ CI:0.00-0.69).Conclusion Less new psychoactive substances abuse might be associated with longer duration of MMT treatment.And inappropriate support from family and friends might increase the risk of abusing new psychoactive substances in MMT clients,especially in clients who used opioid.

Characteristics and influencing factors regarding social relations among men who have sex with men / 中华流行病学杂志

Objective To study the characteristics of social relations and relative factors among MSM in Guangzhou.Methods Data was collected through a cross-sectional study in Guangzhou from November 2016 to May 2017.Sample size was estimated and participants were recruited from the voluntary counseling and testing services (VCT) which were set for MSM population,by nongovernmental organizations (NGOs) and the Centers for Disease Control and Prevention (CDC).Social ties and demographic characteristics of the respondents and their sexual partners were analyzed through both Chi square test and generalized estimating equations (GEE).Results A total of 1 073 MSM,together with their nominated 4 301 partners were successfully recruited and involved in this study.Age (OR=1.2,P=0.01) and non-internet based intercourse (OR=1.65,P＜0.01) were easy to form close relation with strong ties.Compared with MSM traditional venues (chess and cards room,tea room bathhouse,club),general public venue (bars,KTV,parks,shopping malls,schools,restaurants) (OR=1.46-3.12,P＜0.01) showed close relation with strong ties.Our finding showed that MSM at the age of 18-25 preferred to build weak ties with the older MSM,while the 26-30-year-olds and 31-40-year-olds prefer to establish weak ties with younger partners but the 41-50-year-olds preferred to develop weak ties with one that were ten years younger.Conclusions Clusters were noticed in the MSM populations when grouping and making friends with ones at different age.Characteristics regarding the relationship between sexual partners in choosing venues and ways of dating were different.Targeted intervention programs need to be explored innovatively.

New psychoactive substances abuse among patients with access to methadone maintenance treatment in Jiangsu province: a case-control study / 中华流行病学杂志

Objective To explore the reasons and factors associated with new psychoactive substances abuse among patients with access to methadone maintenance treatment (MMT).Methods A well-developed questionnaire and urine tests were used to collect information about demographic characteristics,condition of MMT and drug abuse,family and social support of MMT clients.A 1 ∶ 1 matched case-control study was conducted,and conditional logistic regression model was used to identify factors associated with new psychoactive substances abuse.Results A total of 212 (106 pairs) clients receiving MMT were recruited,and most of them were males (78.3％,166/212),married or cohabitant (48.6％,103/212) and unemployed (63.2％,134/212).The average age of the clients was (45.1 ± 7.2) years.The main types of abused new psychoactive substances were benzodiazepine (62.3％,66/106) and methamphetamine (39.6％,42/106).The proportion of abusing multi new psychoactive substances was 8.5％ (9/106).Results from multivariate conditional logistic regression analysis indicated that using opioid drug during the past 6 months of MMT treatment might increase the risk of abusing new psychoactive substances (OR=3.25,95％CI:1.35-7.79),benzodiazepine (OR=3.25,95％CI:1.11-9.47) and methamphetamine (OR =13.31,95 ％ CI:1.12-158.01).Moreover,MMT for more than 9 years reduced the risk of abuse of new psychoactive substances (OR=0.03,95％ CI:0.01-0.21),benzodiazepine (OR=0.02,95％ CI:0.00-0.36) and methamphetamine (OR=0.02,95％ CI:0.00-0.69).Conclusion Less new psychoactive substances abuse might be associated with longer duration of MMT treatment.And inappropriate support from family and friends might increase the risk of abusing new psychoactive substances in MMT clients,especially in clients who used opioid.

Characteristics and influencing factors regarding social relations among men who have sex with men / 中华流行病学杂志

Objective To study the characteristics of social relations and relative factors among MSM in Guangzhou.Methods Data was collected through a cross-sectional study in Guangzhou from November 2016 to May 2017.Sample size was estimated and participants were recruited from the voluntary counseling and testing services (VCT) which were set for MSM population,by nongovernmental organizations (NGOs) and the Centers for Disease Control and Prevention (CDC).Social ties and demographic characteristics of the respondents and their sexual partners were analyzed through both Chi square test and generalized estimating equations (GEE).Results A total of 1 073 MSM,together with their nominated 4 301 partners were successfully recruited and involved in this study.Age (OR=1.2,P=0.01) and non-internet based intercourse (OR=1.65,P＜0.01) were easy to form close relation with strong ties.Compared with MSM traditional venues (chess and cards room,tea room bathhouse,club),general public venue (bars,KTV,parks,shopping malls,schools,restaurants) (OR=1.46-3.12,P＜0.01) showed close relation with strong ties.Our finding showed that MSM at the age of 18-25 preferred to build weak ties with the older MSM,while the 26-30-year-olds and 31-40-year-olds prefer to establish weak ties with younger partners but the 41-50-year-olds preferred to develop weak ties with one that were ten years younger.Conclusions Clusters were noticed in the MSM populations when grouping and making friends with ones at different age.Characteristics regarding the relationship between sexual partners in choosing venues and ways of dating were different.Targeted intervention programs need to be explored innovatively.

Epidemiological characteristics and latent class analysis of non-marital heterosexual behaviors among human immunodeficiency virus/acquired immunodeficiency syndrome individuals in Jiangmen, Guangdong province between 2015 and 2017 / 中华预防医学杂志

Objective@#To study the epidemiological characteristics and latent classes of non-marital heterosexual transmission among human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS) individuals in Jiangmen, Guangdong province between 2015 and 2017.@*Methods@#HIV/AIDS cases from Chinese HIV/AIDS Comprehensive Response Information Management System were collected from January 1, 2015 to December 31, 2017. Inclusion criteria of HIV/AIDS were heterosexual transmission, non-marital heterosexual contact and older than 15 years. Exclusion criteria were homosexual contact, repeated reports, injecting drugs, current address in the non-Jiangmen area and not classified non-marital heterosexual contact. A total of 665 HIV/AIDS cases were included in this study. The general demographic characteristics (gender, age, ethnicity, education, occupation, etc.), floating population characteristics, HIV high-risk behaviors, HIV testing and other information were collected from database. Chi square test was used to compare the infection status of HIV/AIDS with different characteristics through commercial channels, and the latent class model was used to analyze the latent classes of HIV/AIDS.@*Results@#Among 665 cases, the age was (48.73±15.61) years old. And 46.5% (309/665) cases were married and 73.8% (491/665) were male. Four classes were identified as heterogeneous sub-population by the latent class analysis: the first class occupied 40.13% (267 cases) with feature of nearly equal proportion of males and females and higher proportion of non-service industry workers; the second class occupied 37.40% (248 cases) with features of more than 46 years old, nearly all males, high proportion of farmers, high proportion of marital status, low education and the low propensity of floating; the third class occupied 11.90% (79 cases) with feature of cases from voluntary HIV testing and counseling in center for disease control and prevention; the forth class occupied 10.57% (70 cases) with the feature of less 45 years old, high proportion of service industry workers, no marital history and higher education.@*Conclusions@#HIV/AIDS transmitted by non-marital heterosexual sex in Jiangmen city during 2015-2017 could be divided into four latent classes according to epidemic characteristics, which could provide appropriate classified guidance for AIDS prevention and treatment.

Qualitative research on factors of HIV testing among men who have sex with men in China based on Blued / 中华预防医学杂志

Objective@#To understand the cognition and attitudes of men who have sex with men (MSM) towards HIV testing and explore in-depth reasons preventing them from testing.@*Methods@#The function of "opinion" in Blued, a gay geo-social networking application (GSN), was adopted to collect qualitative data of ideas and attitudes towards HIV testing of the users between December 2017 and January 2018. The data was analyzed based on grounded theory approach.@*Results@#28 269 Blued users participated in the activity and 1 977 posted comments. Four key themes were identified, i.e. no/low risk of contracting HIV, stigmatization of HIV testing, long-term relationship and conventional impediments of HIV testing.@*Conclusion@#The cognition and attitudes of the target population derived from the analysis of "opinion" function in Blued, such as the stigmatization of the behavior of HIV testing influencing the attitude of HIV testing, could help researchers build a more accurate detection and promotion strategy instead of a very general intervention on the public.

The association between the characteristics of egocentric network and HIV prevalence among men who have sex with men / 中华预防医学杂志

Objective@#This study aimed to analyze the association between the characteristics of egocentric network and HIV prevalence among men who have sex with men (MSM) through social network analysis.@*Methods@#The study was conducted in Guangzhou city from November 2016 to June 2017 using convenient sampling method. Participants were recruited from 13 voluntary counseling and testing (VCT) locations. Data were collected by using nomination generation and nomination interpretation methods. Questionnaire includes two parts, the first part about the social tie, and the second one about social demography and behavioral characteristics of respondents and their nominees. The multivariate logistic regression was applied to quantify the association.@*Results@#8.67%(93/1 073) HIV antibody positive MSM had been detected in 1 073 respondents who nominated 4 301 partners in total. Compared to egocentric sexual network with a size of 1-2, the size of sexual network larger than 3 (OR=1.68, 95%CI: 1.07-2.65) were associated with HIV infection. Compared to egocentric risk sexual network with a size of 1-2, the size of risk sexual networks larger than 3 (OR=1.87, 95%CI: 1.06-3.31) were associated with HIV infection. There were no significant association between marital similarity of respondents and their nominees, the type of the relationship of sexual partners and HIV prevalence (P>0.05).@*Conclusion@#The composition of social network in MSM is related to their susceptibility of HIV infection. MSM population with a large sexual network is more susceptible to HIV infection.

The advance of eye imaging technology is crucial in eye refractive researches / 中华实验眼科杂志

Recently,various eye refractive problems have attracted widespread attentions from scholars.In order to further explore the mechanism of the occurrence and development of eye refractive problems,a large amount of eye imaging technologies and analysis systems were born and applied to eye refractive researches,such as the mechanism of myopia and presbyopia,as well as the whole eye biological parameters measurement.In this literature,combining the research progress of our laboratory,we described the advances of eye imaging technology and its application in the field of ophthalmology.Based on the importance of eye imaging technology in the eye refractive researches,we propose that in order to realize the regulatory effect research of 'visual cognition feedback system monitoring technology',the development of eye imaging technology should be based on the need of 'in vivo,nondestructive,objective and accurate' and develop in the direction of 'real-time,dynamic,intelligent analysis'.

The pilot study of short-term correlation between air quality index and the outpatient allergic rhinitis cases in autumn and winter in Beijing / 中华老年医学杂志

Objectives To determine the short term relationship between the number of old allergic rhinitis(AR) patients and the air quality index(AQI) data in autumn and winter in Beijing.Methods Between October 2015 and December 2015,the AQI index data and the number of old outpatients with AR in Beijing Hospital were collected and the relation between them was evaluated by Pearson correlation analysis.Results The AR patients aged over 60 were 1 892 cases (36.72％ of the total number of outpatients).The males were 953 (50.4％),The females were 939 (49.6％).The number of old outpatients with AT changed from 4/d to 39/d.When the AQI rised,the total number of old outpatients was increased;however,when the AQI rised to a certain extent,especially to the serious pollution value (＞300),the number of old outpatients was declined.Pearson correlation analysis showed that there was a negative correlation between the amount of old AR patients and the AQI in the high incidence of air pollution seasons in Beijing (r=0.311,P＜0.01).Conclusions Air pollution is one of the most important reasons for the increased rate of AR patients in the elderly.

Characteristics of non-marital and non-commercial heterosexual transmission of HIV infection in Miao-Dong Autonomous prefecture of Qiandongnan / 中华预防医学杂志

Objective@#The goal of this research was to understand the demographic distribution and related factors of non-marital and non-commercial heterosexual transmission (non-commercial transmission) for HIV/AIDS (human immunodeficiency virus/acquired immunodeficiency syndrome).@*Methods@#Data related to HIV/AIDS infected by non-marital heterosexual transmission and whose present address was in Qian Dongnan, were collected from Information System on the HIV/AIDS Prevention and Control. Information included demographic characteristics, the members of non-marital sex partners, transmission path, detection source, CD4+T lymphocyte level, et al. cases belong to homosexual history, injective drug use or non-classified non-marital heterosexuality transmission were excluded, totally collect HIV/AIDS 919 cases. Multivariate logistic regressions were used to analyze potential factors associated with non-marital and non-commercial heterosexual transmission. In addition, in March and June 2017, using a convenience sampling, we conducted one-to-one interviews among 10 HIV/AIDS who were infected by non-marital heterosexuality and had non-marital and non-commercial heterosexual experience in Kaili Center for Disease Control and Prevention. The content of the interview included basic information, sexual orientation, the main place of making friends and sexual behavior, attitude to commercial heterosexuality and non-martial and non-commercial heterosexuality and so on.@*Results@#Out of the 919 cases, 645 (70.2%) were male, the proportion of non-commercial transmission was 55.06% (506). The proportion of female HIV/AIDS with non-commercial transmission was 84.7% (232), which was higher than male (42.5%(274)) (χ2=138.35, P<0.001). The proportion of Han HIV/AIDS with non-commercial transmission was 61.5% (275), which was higher than other religion (52.2%(412)) (χ2=6.32, P=0.012). The proportion of HIV/AIDS with non-commercial transmission who had 0-5 non-marital sexual partners was 58.8% (498), which was higher than who had>5 non-marital sexual partners (11.1%(8)) (χ2=61.10, P<0.001). The proportion of HIV/AIDS with non-commercial transmission who lived mobile was 72.9% (94), which was higher than who lived fixedly (52.2%(412)) (χ2=19.34, P<0.001). Qualitative interviews results revealed that the age of the respondents were 22-69. Respondents whose ages are in 22-34 were more likely to use mobile phone (4/10) and respondents whose ages are in 35-69 were less likely to look partners through party and the context of working.@*Conclusion@#The proportion of cases being infected by non-marital and non-commercial heterosexual transmission in Qian dongnan was higher than general national levels. The characteristics of sex, marriage status, migration, vocation, the members of non-marital sex partners were significant differed between commercial heterosexual transmission and non-marital and non-commercial heterosexual transmission.

Application of surgery experience teaching in early clinical contact education / 中华医学教育探索杂志

To discover medical teaching method which is more funny and effective in early clinical contact education, Eye optical hospital affiliated to Wenzhou Medical University set up oph-thalmic microsurgery experience teaching course for junior medical students and set a variety of eye surgery simulation experience content, such as conjunctival suture surgery, corneal suture surgery, cataract surgery, eye surgery simulation and so on, which can effectively arouse students' professional interest in learning and promote students' thinking and exploration to their profession.

Effect of monocular depth perception on accommodative response / 中华实验眼科杂志

Background Different depthes or distances are prompted with many visual cues on the flat screen.Which kind of depth cues plays a major role in the accommodation of human eyes,in addition,whether this effect exists in the different distance are still below understood.Objective This study was to research the effect of the monocular space depth perception on accommodative response at different distances,and to analyze the effect of linear perspective and size-constancy perceptual depth cues on the level and amplitude of accommodative fluctation.Methods Four groups of visual targets were designed by FLASH software and placed at the front of eyes with the distance of 50 cm or 33.3 cm,representing static change from far to near and dynamic change from far to near,from near to far respectively.Twenty-six healthy volunteers aged 22-26 years were included in this study,with the spherical power of (-4.06± 1.99) D and cylindrical power of (-0.38±0.41) D under the informed consent.The accommodative response and accommodative fluctuations during monocularly watching the targets were recorded at 5 times/second by Grand Seiko WAM 5500 automatic infrared refractor.This study was approved by Ethic Committee of Wenzhou Medical University,and written informed consent was obtained from each subject before entering the study group.Results At the distance of 50 cm,the accommodative response caused by the depth perception of near was (1.52±0.46) D,the one of distance was (1.37±0.46) D,with a significant difference of 0.15 D under the combined effect of linear perspective and size-constancy (P =0.016).The accommodative response caused by the depth perception of big car was (1.43 ± 0.35) D,and the one of small car was (1.43 ± 0.36) D,without statistically significant difference under the effect of size-constancy alone (P =0.467).At the distance of 33.3 cm,the accommodative response caused by the depth perception of near was (2.40±0.53)D,and the one of distance was (2.35 ±0.51) D,without significant difference under the combined effect of linear perspective and size-constancy (P=0.379).The accommodative response caused by the depth perception of big car was (2.38±0.48)D,the one of small car was (2.39±0.52)D,without statistically significant difference under the effect of size-constancy alone (P =0.820).In addition,the total curve of accommodative microfluctuation showed apparent fluctuation periodically caused by the distance perception involving linear perspective only.Conclusions Monocular space depth perception has some impacts on the accommodative response at certain distance.Linear perspective,which is one of the depth cues of space perception,plays a major role in the accommodative response.Compared with the size-constancy,linear perspective can provide depth perception at higher level.The size-constancy has a little or contrast impact to the accommodation,because it depends on the assistance from other depth cues like linear perspective.

Prevalence of informing of HIV infection status during medical care seeking and influential factors among people living with HIV/AIDS / 中华流行病学杂志

<p><b>OBJECTIVE</b>To understand the prevalence of informing doctors of the HIV infection status during medical care seeking and influential factors among people living with HIV/AIDS.</p><p><b>METHODS</b>The study was conducted among people living with HIV/AIDS in 7 provinces in China, including those receiving HIV test, HIV counsel and HIV infection treatment. The data were analyzed with software SAS 9.2. Chi-square test was used to compare the informing rates in patients with different characteristics. Univariate and multivariate logistic regression analyses were conducted to identify the influential factors.</p><p><b>RESULTS</b>Of the 2 432 HIV/AIDS patients, 49.7% (716/1 442) didn't inform the doctors of their HIV infection status actively. The non-active informing rate was 51.9% (559/1 077) in males, 62.9% (212/337) in age group 18-30 years old, 58.1% (555/955) in those with a educational level >primary school, 65.7% (241/367) in those working in private/joint companies or the self employed and 62.5% (197/315) in those living in small cities. The non active informing rate was highest in those infected through sexual contact (66.3%, 275/415). Multivariate logical regression analysis indicated that those infected through illegal blood donation would like to inform of the HIV infection status actively (OR=0.083, 95% CI: 0.049-0.141) , but those working in private/joint companies or the self employed would like not to inform of the HIV infection status actively (OR=1.531, 95% CI: 1.017-2.304).</p><p><b>CONCLUSION</b>The non active informing rate of HIV infection status was high in people living with HIV/AIDS. It is necessary to conduct the targeted health education to encourage people living with HIV/AIDS to inform of their HIV infection status actively.</p>

Prevalence of HIV infection and syphilis, sexual behaviors and awareness of HIV/AIDS related knowledge among men who have sex with men in China: a Meta-analysis of data collected from 2010 to 2013 / 中华流行病学杂志

<p><b>OBJECTIVE</b>To understand the time and area specific prevalence of HIV infection and syphilis, sexual behaviors and awareness of HIV/AIDS related knowledge among men who have sex with men (MSM) in the mainland of China during 2010-2013.</p><p><b>METHODS</b>All the published academic papers on the prevalence of HIV infection and syphilis among MSM in the mainland of China from 2010 to 2013 were collected from CNKI, Wanfang and PubMed databases. Meta-analysis was performed by using software Stata 12.0.</p><p><b>RESULTS</b>Sixty six papers were selected. From 2010 to 2013 the pooled prevalence of HIV infection were 7.7% among the MSM (95% CI: 7.2%-8.3% ) and increased year by year, but the pooled prevalence of HIV infection was highest in southwestern China (12.0%). The pooled prevalence of syphilis were 10.9% among the MSM (95% CI: 9.8%-12.1%), and the pooled prevalence of syphilis was highest in southern China (14.4%). The incidence of anal sex was high (84.2%) in the past 6 months, but the consistent condom use rate was low (44.8%). The AIDS related knowledge awareness was high in the MSM (88.4%).</p><p><b>CONCLUSION</b>The prevalence of HIV infection and syphilis were high among the MSM in the mainland of China during 2010-2013. It is necessary to explore the comprehensive intervention measures to promote condom use among MSM although they have high awareness of AIDS related knowledge.</p>