Case-control study of risk factors for recurrent low hemoglobin level among primary and middle school students / 上海预防医学

Objective To explore the risk factors of recurrent low hemoglobin(RLH) level among students from 6 to 13 years old, and to formulate strategies and policies in this regard. Methods Surveillance on hemoglobin concentration was conducted among 71 742 students aged from 6 to 13y between 2013-2014 based on the annual physical examination for primary and middle school in Minhang District.Of those students, 670 were diagnosed with low hemoglobin level according to WHO criteria.A 1 ︰ 1 matched case-control study was conducted based on gender, age and school type.Questionnaire surveys for data collection were analyzed using Cox′s proportional hazards regression. Results Factors as pregnancy anemia(OR=2.32, 95%CI:1.49-3.63), non-pregnancy anemia(OR=4.65, 95%CI:1.22-17.69), maternal anemia(OR=2.51, 95%CI:1.50-4.21), drinking strong tea(OR=2.56, 95%CI:1.27-5.13) and dietary bias(OR=1.94, 95%CI:1.45-2.59) were risk factors of recurrent low hemoglobin level.Chewing pencils(OR=1.80, 95%CI:1.25-2.59) or toys(OR=1.79, 95%CI:1.10-2.86) and wasting(OR=3.37, 95%CI:1.11-10.21)might be the risk factors. Conclusion The risk factors of recurrent low hemoglobin level among students aged from 6 to 13 years are related to maternal anemia status and their dietary habits.We should strengthen education for women of child-bearing age, and help to develop healthy eating practices for their babies.Emaciated students should be focused on in this regard.

Factors related to thyroid carcinoma in Zhejiang province: a matched case-control study / 中华流行病学杂志

Objective To explore the influencing factors related to thyroid carcinoma.Methods Matched by sex,age and original residential areas,659 pairs of cases and controls were recruited and studied.Methods including both single factor analysis and multivariate conditional logistic regression analysis were carried out to identify the influencing factors.Results Multivariate conditional logistic regression analysis showed that higher education,being diabetic,alcohol intake,tea drinking,occupational physical activity and the frequency of eating fishes/eggs etc.,were potentially protective to thyroid carcinoma.Depression,personal history of CT examination and less salt intake seemed to be risk factors on thyroid carcinoma.For males,factors as alcohol intake,tea drinking,occupational physical activity and frequent egg-eating appeared protective.For females,higher education,diabetes,tea drinking,occupational physical activity,frequent consumption of fishes/eggs,short duration of menstruation appeared as possibly protective.Conclusion Higher education,diabetes,alcohol intake,tea drinking,occupational physical activity,frequent consumption of fishes/eggs,depression,personal history of CT examination and less salt intake served as potential influencing factors to thyroid carcinoma.

Factors related to thyroid carcinoma in Zhejiang province: a matched case-control study / 中华流行病学杂志

Objective To explore the influencing factors related to thyroid carcinoma.Methods Matched by sex,age and original residential areas,659 pairs of cases and controls were recruited and studied.Methods including both single factor analysis and multivariate conditional logistic regression analysis were carried out to identify the influencing factors.Results Multivariate conditional logistic regression analysis showed that higher education,being diabetic,alcohol intake,tea drinking,occupational physical activity and the frequency of eating fishes/eggs etc.,were potentially protective to thyroid carcinoma.Depression,personal history of CT examination and less salt intake seemed to be risk factors on thyroid carcinoma.For males,factors as alcohol intake,tea drinking,occupational physical activity and frequent egg-eating appeared protective.For females,higher education,diabetes,tea drinking,occupational physical activity,frequent consumption of fishes/eggs,short duration of menstruation appeared as possibly protective.Conclusion Higher education,diabetes,alcohol intake,tea drinking,occupational physical activity,frequent consumption of fishes/eggs,depression,personal history of CT examination and less salt intake served as potential influencing factors to thyroid carcinoma.

A case control study on risk factors of pulmonary tuberculosis among elderly people in Nanchang City / 预防医学

Objective To explore the risk factors of elderly people with pulmonary TB,and to provide the scientific evidence of prevention and interventions for tuberculosis among the old people in Nanchang City.Methods 1∶1 case control study was performed .A total of 390 pulmonary TB patients over 60 years old were selected as case group.One healthy person with the same gender and within 2 year age difference was selected to match each case.Interviews were carried out with a uniformly designed questionnaire.Logistic regression models were used for analysis.Results A total of 120 smear positive tuberculosis patients and 270 smear negative tuberculosis patients were investigated.And 72.82% male and 27.18% female of the 390 TB patients were investigated.Average age of patients was 70.34 ±7.75.Multivariate condition logistic regression analysis showed smoking(OR =2.359,95%CI:1.368 -4.068),contacting tuberculosis(OR =3.357,95%CI:1.854 -6.075),BMI 18.5 -24.9(OR =0.175,95%CI:0.056 -0.546),education (OR =0.110,95%CI:0.036 -0.332),annual average income (OR =0.475,95%CI:0.332 -0.681),per capita living space(OR =0.946,95%CI:0.920 -0.973)and drinking tea (OR =0.398,95%CI:0.268 -0.592)were the influencing factors(P <0.05).Conclusion Health education should be promoted auording to the risk factors,and patients manage ment should be streng thened.

Effectiveness of Varicella Vaccination Program in Preventing Laboratory-Confirmed Cases in Children in Seoul, Korea

A universal one-dose varicella vaccination program was introduced in 2005 in Republic of Korea. However, the incidence of varicella in Korea has tripled over the last decade. We conducted a community based 1:1 matched case-control study to assess the effectiveness of one MAV strain-based vaccine and three Oka strain-based vaccines licensed for use in Korea. All cases were children in Seoul, Korea with varicella who were reported to the National Notifiable Disease Surveillance System in Seoul during 2013. The controls were age-matched children with mumps or scarlet fever but no history of varicella. We included 537 cases and 537 controls. The overall effectiveness of one dose of varicella vaccination was 13% (95% confidence interval [CI], −17.3–35.6). Of the four licensed varicella vaccines, only one was highly effective (88.9%; 95% CI, 52.1–97.4). The vaccine effectiveness for the other vaccines were 71.4% (95% CI, −37.5–94.1), −5% (95% CI, −61.9–31.9), and −100% (95% CI, −700–50.0). The overall effectiveness of vaccination was 75.8% (95% CI, 22.8–92.4) in the first year after vaccination and decreased thereafter; the effectiveness became −7.2% (95% CI, −130.9–59.2) in the fourth year after vaccination. Further studies are warranted to investigate reduced effectiveness of varicella vaccines in Korea.

Oncologic Safety of Immediate Breast Reconstruction for Invasive Breast Cancer Patients: A Matched Case Control Study / 한국유방암학회지

PURPOSE: The purpose of this study was to compare locoregional recurrence-free survival (LRFS) and disease-free survival (DFS) between patients undergoing mastectomy and immediate breast reconstruction (IBR) and those undergoing mastectomy alone. METHODS: A retrospective review of patients who underwent mastectomy and immediate breast reconstruction for resectable invasive breast cancer between 2002 and 2010 at a single center was conducted. These cases were matched to patients who underwent mastectomy alone in the same time period, performed by 1:2 matching. Matching control variables included age, tumor size, axillary lymph node metastasis, and estrogen receptor status. Overall, 189 patients were identified in the IBR group, and 362 patients were matched to this group. RESULTS: In the IBR group, 75 patients (39.7%) underwent conventional total mastectomy, 78 (41.3%) underwent skin-sparing mastectomy (SSM), and 36 (19.0%) underwent nipple-sparing mastectomy (NSM). The IBR group was significantly younger than the control group (41.9 and 45.1 years, respectively) (p=0.032), in spite of matching between three age groups. The DFS rates were similar between the IBR group and mastectomy alone group, at 92.0% and 89.9%, respectively, at 5-year follow-up (log-rank test, p=0.496). The 5-year LRFS was 96.2% in the IBR group and 96.4% in the mastectomy alone group (log-rank test, p=0.704), similar to data from previous reports. Subgroup analyses for SSM or NSM patients showed no differences in LRFS and DFS between the two groups. Additionally, in stage III patients, IBR did not cause an increase in recurrence. CONCLUSION: IBR after mastectomy, including both SSM and NSM, had no negative impact on recurrence or patient survival, even in patients with advanced disease.

Factores de riesgo asociados a la apendicitis aguda perforada

Objetivo: Determinar los factores de riesgo asociados a la apendicitis aguda perforada en el Hospital de Especialidades Pediátricas "Omar Torrijos Herrera" (HEPOTH) Materiales y métodos: Estudio de casos (apendicitis perforada) y controles (apendicitis flegmonosas) pareados 1:2 de febrero 2003 a enero 2009 en el HEPOTH. Se analizaron 7 variables con la t de Student y 4 cualitativas con el x2 corregido de McNemar. Resultados: Se obtuvieron 107 casos y 178 controles. El sexo, la edad promedio de intervención y el peso promedio no fueron significativamente distintos. La mayoría de los sujetos procedía de la provincia de Panamá. El tiempo de intervención fue la variable con mayor fuerza de asociación ( 66.5 vs 34.2 horas ; p<.001; IC 95% 21.0-46.0) aunque también resultaron estadisticamente significativos el percentil del peso para la edad ( p=.048), los leucocitos preoperatorios (p=.027), los neutrófilos preoperatorios (p=.010), la historia de vómitos (p<.0001), de diarrea (p<.0001) para a perforación apendicular. La temperatura preparatoria promedio fue significativamente distinta en ambos grupos (p<.001) pero clínicamente no relevante (37.8 vs 37.2ºC). El uso de antibióticos preoperatorios resultó ser un factor protector (p<0.0001); OR 0.31; IC 95% 0.20-0.47). Conclusiones: El tiempo de intervención desde el primer síntoma es el principal factor de riesgo para la perforación apendicular. Algunos otros criterios clínicos y paraclínicos también deben tomarse en consideración para el diagnóstico y el tratamiento oportuno. El uso preoperatorio de antimicrobianos profilácticos y analgésicos puede mejorar los resultados y la condición del paciente pediátrico con apendicitis aguda.

Aim: To determine the risk factors associated with perforated acute appendicitis at the Hospital de Especialidades Pediátricas "Omar Torrijos Herrera" (HEPOTH) Materials and methods: Matched 1:2 cases control study ( perforated vs flegmonous) from February 2003 to January 2009 at the HEPOTH. Seven quantitative variables were analyzed with Student t and 4 qualitatives variables were analyzed McNemar ´s corrected x2. Results: One hundred and seven cases and 178 controls were obtained.Gender, mean intervention age, and mean weight were not significantly different . Most of the subjects came from the province of Panama. Time until intervention was the variable with the most association strength ( 66.5 vs 34.2 hours ; p<.001; IC 95% 21.0-46.0) even though weight for age percentile ( p=.048), preoperatory leucocytes (p=.027), preoperatory neutrophils (p=.010), and the history of vomits (p<.0001), and diarrhea(p<.0001) also resulted statistically significant for appendices perforation. Mean preparatory temperature was significantly different (p<.001) but not clinically relevant (37.8 vs 37.2ºC) between both groups. The use of preparatory antibiotics turned out to be a protection factor (p<0.0001); OR 0.31; IC 95% 0.20-0.47). Conclusions: Time until intervention since the first symptoms is the main risk factor for appendiceal perforation. Some other clinical and paraclinical criteria must also be taken into account for a timely diagnosis and treatment. Preoperatory use of prophylactic antimicrobial and analgesics can improve the results and the condition of the pediatric patient with acute appendicitis.

A 1:1 Matched Case-control Study on the Risk Factors for Inguinal Hernia in Children / 中国慢性病预防与控制

Objective To explore the risk factors for inguinal hernia in children.Methods A 1:1 matched case-control study which based on hospital group data was carried out.201 cases aged 0～6 years with inguinal hernia and controls were enrolled,and their parents were investigated with questionaire.Conditional logistic regression model was used for single factor and multivariate factoranalysistoestimateoddsratios(OR) and the 95% eonfidence interval(95% CI).Results Inguinal hernia was related to ehildren ' s constipation(0R=3.520,95%CI:1.238~10.015),children's cry(OR=6.532,95%CI:2.651~16.091),mother ate pickles(OR=2.529, 95%CI:1.271~5.031) and maternal anemia(OR=6.809,95%CI:2.530～18.322) during the period of one month before pregnancy and the first 3 months of gestation,the children's family history of inguinal hernia(OR=I 1.250,95%CI:4.766～26.553).Conclusion Children's constipation,children's cry,maternal anemia and eating pickles during the period of one month before pregnancy and the first 3 months of gestation,children ' s family history of inguinal hernia are the risk factors for children' s inguinal hernia.

A Case-Control Study on Risk Factors for Advanced Schistosomiasis Japonica / 中国寄生虫学与寄生虫病杂志

Objective To investigate risk factors for the development of advanced schistosomiasis. Methods The case\|control study was designed with a match of 1∶1 and 1∶2. Healthy persons and chronic schistosomiasis patients were used as control. Each group was composed of 213 cases. Items investigated included: history of schistosomiasis and treatment, exposure to the contaminated water, social\|economical condition and nutritional status, other concomitant diseases. Cellular and humoral immunity, HBVMs and ABO blood groups were also detected. Statistical analysis was performed by 1∶1 and 1∶2 matched single and stepwise conditional logistic regression analysis with SAS software. Results By stepwise conditional logistic regression analysis, it was revealed that number of schistosomiasis examination(OR=1^168-1^311), interval from first infection to last treatment(OR=1^142), interval from first infection to this investigation (OR=1^089), \{HBsAg\++\}(OR=4^683-10^759), \{HBcAb\++\} (OR=2^873), \{HBsAg\++\}+\{HBeAb\++\}+\{HBcAb\++\}(OR=7^64) were risk factors of developing advanced schistosomiasis. The average living space and cellular immunity were lower in advanced schistosomiasis patients than others. No association was found between advanced schistosomiasis and ABO blood groups. Conclusion The development of advanced schistosomiasis is associated with repeated infections, and delayed or incomplete treatment. Combined infection with hepatitis B, poor socio\|economic conditions and impaired cellular immunity may increase the pathogenetic risk of schistosomiasis.