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1.
Sleep Medicine and Psychophysiology ; : 3-8, 2023.
Article in English | WPRIM | ID: wpr-1002833

ABSTRACT

Periodic limb movement disorder (PLMD) is a sleep-related movement disorder characterized by involuntary, rhythmic limb movements during sleep. While PLMD itself is not considered life-threatening, its association with certain underlying health conditions raises concerns about mortality risks. PLMD has been found to be associated with cardiovascular diseases such as hypertension and cardiovascular disease. The fragmented sleep caused by the repetitive limb movements and associated arousals may contribute to sympathetic activation, chronic sleep disruption, sleep deprivation, and subsequent cardiovascular problems, which can increase mortality risks. The comorbidities and health factors commonly associated with PLMD, such as obesity, diabetes, and chronic kidney disease, may also contribute to increased mortality risks. PLMD is often observed alongside other neurological disorders, including restless legs syndrome (RLS) and Parkinson's disease. The presence of PLMD in these conditions may exacerbate the underlying health issues and potentially contribute to higher mortality rates. Further research is needed to elucidate the specific mechanisms linking PLMD to mortality risks and to develop targeted interventions that address these risks.

2.
Psychiatry Investigation ; : 897-903, 2023.
Article in English | WPRIM | ID: wpr-1002754

ABSTRACT

Objective@#The suicide rate in Korea was the highest among countries in the Organisation for Economic Co-operation and Development in 2019. In a previous study, higher intake of vegetables and fruits was associated with a lower risk of suicidal ideation, and carotene-rich fruits and vegetables lowered the risk of depression. This study aimed to examine the direct relationship between carotene intake and suicidal ideation, adjusting for the effect on depression. @*Methods@#This study used data from the Korea National Health and Nutrition Examination Survey (KNHANES) conducted in 2012, 2013, and 2015. Carotene intake was assessed through a food intake frequency survey with a 24-hour recall. Suicidal ideation and depression were assessed using the mental health section of the KNHANES. We applied logistic regression to assess the relationship between carotene intake and suicidal ideation, adjusting for potential confounders. @*Results@#A total of 5,480 females aged 19–64 years were included in this study. Carotene intake was significantly lower in the suicidal ideation group (3,034.5±1,756.4 μg/day) than in the nonsuicidal ideation group (3,225.4±1,795.1 μg/day) (p=0.015). We found a significant inverse association between carotene intake and the risk of suicidal ideation after adjusting for potential confounders (odds ratio=0.934, 95% confidence interval=0.873–0.999). @*Conclusion@#These results suggest that carotene intake may be inversely associated with the risk of suicidal ideation. Our findings may inform the development of new nutritional interventions to prevent increases in the risk of suicide worldwide.

3.
Psychiatry Investigation ; : 1061-1068, 2023.
Article in English | WPRIM | ID: wpr-1002735

ABSTRACT

Objective@#This study aimed to identify the factors affecting posttraumatic stress disorder (PTSD) symptom remission prospectively through a 1-year follow-up of sexual assault (SA) victims. @*Methods@#A total 65 female SA victims who visited the crisis intervention center were included. Self-administered questionnaires regarding PTSD symptoms and PTSD related prognostic factors were conducted at both recruitment (T1) and 1 year after recruitment (T2). The multivariate analyses were used to determine the significant predictors of PTSD remissionon-remission state 1 year after SA. @*Results@#In logistic regression analysis, both anxiety and secondary victimization were identified as significant factors explaining the results on PTSD remissionon-remission state at T2 (Beck’s Anxiety Inventory [BAI], p=0.003; Secondary Victimization Questionnaire, p=0.024). In a linear mixed analysis, both depression and anxiety were found to be significant variables leading to changes in Posttraumatic Diagnostic Scale for Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition from T1 to T2 (BAI, p<0.001; Center for Epidemiological Studies Depression Scale, p<0.001). @*Conclusion@#Depression, anxiety symptoms, and secondary victimization after SA were associated with PTSD symptom non-remission 1 year after SA.

4.
Journal of the Korean Society of Biological Therapies in Psychiatry ; (3): 79-86, 2023.
Article in English | WPRIM | ID: wpr-1001843

ABSTRACT

Objectives@#The aim of this study was to investigate temperament and character associated with resilience in patients with bipolar disorder (BD). @*Methods@#A total of 55 outpatients diagnosed with BD according to the Diagnostic and Statistical Manual of Mental Disorders, 4th Edition (DSM-IV), and 55 healthy controls matched by age and sex with the BD group were recruited.All participants completed the Connor-Davidson Resilience Scale (CD-RISC) and Temperament and Character Inventory (TCI). Multiple linear regression analysis was performed by controlling for age, length of education, age of onset, number of depressive episodes, and number of hospitalizations to determine factors related to resilience. In addition, multiple regression analysis was performed using the interaction term to investigate whether temperament and character associated with resilience differed between the two groups. @*Results@#Patients with BD showed higher harm avoidance (p<0.001) and lower self-directedness (p<0.001) among the TCI dimensions compared to the control group. In multiple regression analysis, harm avoidance (β=-0.274, p=0.025) and self-directedness (β=0.431, p=0.002) were associated with resilience in patients with BD, while harm avoidance (β=-0.411, p=0.008), persistence (β=0.244, p=0.031), and cooperativeness (β=0.264, p=0.037) were associated with resilience in the control group. Self-directedness had a different relationship with resilience between the two groups (β=0.212, p=0.001). @*Conclusions@#The findings suggest that BD patients’ particular temperament and character are associated with resilience.Furthermore, temperament and character related to resilience differed between the BD group and the control group.

5.
Journal of the Korean Academy of Child and Adolescent Psychiatry ; : 242-249, 2023.
Article in English | WPRIM | ID: wpr-1001605

ABSTRACT

Objectives@#Following the coronavirus disease 2019 (COVID-19) pandemic, adolescents have experienced decreased physical activity and a decline in mental health. This study analyzed the association between changes in depressed mood after the COVID-19 pandemic and physical activity among adolescents. @*Methods@#The analysis was based on the results of the 17th Youth Health Behavior Online Survey conducted in 2021, which included 54848 middle and high school students in South Korea. Information on physical activity included low-intensity physical activity lasting >60 min/day, high-intensity physical activity, and strength training exercises. A logistic regression analysis was performed to evaluate the association between physical activity and changes in depression after the COVID-19 pandemic. @*Results@#After adjusting for sociodemographic characteristics and previous depression, adolescents who performed strength training exercises more than once per week had a 0.95-fold lower risk (odds ratio [OR]=0.948, 95% confidence interval [CI]=0.905–0.994, p= 0.027) of increasing depression after the COVID-19 pandemic, while the risk of decreasing depression increased by 1.22-fold (OR=1.215, 95% CI=1.131–1.305, p60 min/day and high-intensity physical activity. @*Conclusion@#Strength-training exercises are significantly associated with the prevention of depression among adolescents following the COVID-19 pandemic.

6.
Journal of the Korean Ophthalmological Society ; : 466-472, 2023.
Article in Korean | WPRIM | ID: wpr-977089

ABSTRACT

Purpose@#We compared the clinical utilities of an amniotic contact lens and temporary amniotic membrane transplantation in patients with persistent corneal epithelial defects. @*Methods@#Patients diagnosed with persistent corneal epithelial defects from November 2019 to July 2022 were randomly assigned to either lens placement for 2 weeks or temporary transplantation for 1 week, and the outcomes were retrospectively analyzed. The best-corrected visual acuity, corneal sensation, tear film break-up time, and corneal opacity were measured before and after the interventions. The treatment success rates, recurrences, and other complications were analyzed during the follow-up period. @*Results@#We placed lenses in 32 patients (32 eyes) and 20 patients (20 eyes) underwent transplantation. In both groups, significant differences in best-corrected visual acuity, corneal sensation, tear film break-up time, and corneal opacity were apparent after intervention vs. before. None of the parameters showed any significant differences in terms of their rates of change. @*Conclusions@#In patients with persistent corneal epithelial defects, amniotic contact lens placement is an effective outpatient procedure and is not inferior to temporary amniotic membrane transplantation.

7.
Korean Journal of Psychosomatic Medicine ; : 73-79, 2022.
Article in English | WPRIM | ID: wpr-968223

ABSTRACT

Objectives@#:Suicide is a global social problem. Social burden caused by suicide is gradually increasing. Various efforts have been made to prevent suicide. Lifestyle changes to western style, especially diet changes, have increased the risk for suicide. Therefore, in this study, we discussed diet as an adjuvant treatment for suicide. @*Methods@#:In this review, we summarized the biochemical mechanism of suicide, and diet as a risk factor for suicide and diet as a protective factor through a web search. @*Results@#:In this study, biochemical mechanisms for suicide were reviewed and diet as a risk factor and diet as a protective factor for suicide were investigated. It was confirmed that neurotoxic effects such as oxidative stress and inflammation in the neural system could increase the risk of suicide. Based on results of previous stud-ies on the relationship between suicide and diet, it was found that heavy use of alcohol, coffee, carbonated soft drink, and fast food were risk factors for suicide. Protective factors for suicide included antioxidants such as vitamin C, carotene, and anti-inflammatory agents such as omega-3 fatty acids found in seafood in large amounts. @*Conclusions@#:The only treatment for suicide is prevention. In this context, effectiveness, accessibility, and safety are important for preventing for suicide. Antioxidants and anti-inflammatory agents that are relatively safe and readily available to the public could be effective adjuvant treatments to decrease the risk of suicide. In addition, it is necessary to educate the public on reducing diets that could increase the risk of suicide

8.
Sleep Medicine and Psychophysiology ; : 21-28, 2022.
Article in English | WPRIM | ID: wpr-939007

ABSTRACT

Objectives@#Our study aimed to investigate the relationship between the anxiety at first year and chronotype and sleep quality at third year in medical students. We also investigated the association between sleep quality, chronotype, depression and resilience at third year. @*Methods@#Fifty two medical students (36 males, 69%, aged 21 ± 0.93) in first year, and forty four medical students (31 males, 70.5%, aged 23.05 ± 0.99) at third year answered Beck Depression Inventory 2, Beck anxiety inventory, Insomnia severity index-K, Composite scale of morningness and Conner-Davidson Resilience scale-10. Multiple linear regression analysises were performed to identify predictors of chronotype, sleep quality and resilience. @*Results@#Higher anxiety (β = -0.434, p = 0.006) at first year was significant predictor of eveningness at third year, while lower anxiety score (β = 0.606, p < 0.001) at first year was significant predictor of sleep quality at third year. Lower sleep quality (β = -0.314, p = 0.042) and eveningness (β = 0.315, p = 0.041) were associated with low resilience at third year. Also, Lesser depression (β = -0.717, p < 0.001) was associated with higher resilience at third year. @*Conclusion@#Our study showed that higher anxiety in first year had significantly related with eveningness and poor sleep quality at third year. In addition, higher sleep quality, morningness and less depression had significantly associated with better resilience at third year.

9.
The Journal of Advanced Prosthodontics ; : 12-21, 2022.
Article in English | WPRIM | ID: wpr-926944

ABSTRACT

PURPOSE@#The purpose of this study was to investigate changes in retention and wear pattern of Locator® and ADD-TOC attachments on a digital milled bar by performing chewing simulation and repeated insertion/removal of prostheses in fully edentulous models. @*MATERIALS AND METHODS@#Locator (Locator®; Zest Anchors Inc., Escondido, CA, USA) was selected as the control group and ADD-TOC (ADDTOC; PNUAdd Co., Ltd., Busan, Republic of Korea) as the experimental group. A CAD-CAM milled bar was mounted on a master model and 3 threaded holes for connecting a bar attachment was formed using a tap. Locator and ADD-TOC attachments were then attached to the milled bar. Simulated mastication and repeated insertion/removal were performed over 400,000 cyclic loadings and 1,080insertions/removals, respectively. Wear patterns on deformed attachment were investigated by field emission scanning electron microscopy. @*RESULTS@#For the ADD-TOC attachments, chewing simulation and repeated insertion/removal resulted in a mean initial retentive force of 24.43 ± 4.89 N, which were significantly lower than that of the Locator attachment, 34.33 ± 8.25 N (P < .05). Amounts of retention loss relative to baseline for the Locator and ADD-TOC attachments were 21.74 ± 7.07 and 8.98 ± 5.76 N (P < .05). @*CONCLUSION@#CAD-CAM milled bar with the ADD-TOC attachment had a lower initial retentive force than the Locator attachment. However, the ADD-TOC attachment might be suitable for long-term use as it showed less deformation and had a higher retentive force after simulated mastication and insertion/removal repetitions.

10.
Korean Journal of Radiology ; : 343-354, 2022.
Article in English | WPRIM | ID: wpr-926770

ABSTRACT

Objective@#To develop and evaluate a deep learning-based artificial intelligence (AI) model for detecting skull fractures on plain radiographs in children. @*Materials and Methods@#This retrospective multi-center study consisted of a development dataset acquired from two hospitals (n = 149 and 264) and an external test set (n = 95) from a third hospital. Datasets included children with head trauma who underwent both skull radiography and cranial computed tomography (CT). The development dataset was split into training, tuning, and internal test sets in a ratio of 7:1:2. The reference standard for skull fracture was cranial CT. Two radiology residents, a pediatric radiologist, and two emergency physicians participated in a two-session observer study on an external test set with and without AI assistance. We obtained the area under the receiver operating characteristic curve (AUROC), sensitivity, and specificity along with their 95% confidence intervals (CIs). @*Results@#The AI model showed an AUROC of 0.922 (95% CI, 0.842–0.969) in the internal test set and 0.870 (95% CI, 0.785–0.930) in the external test set. The model had a sensitivity of 81.1% (95% CI, 64.8%–92.0%) and specificity of 91.3% (95% CI, 79.2%–97.6%) for the internal test set and 78.9% (95% CI, 54.4%–93.9%) and 88.2% (95% CI, 78.7%– 94.4%), respectively, for the external test set. With the model’s assistance, significant AUROC improvement was observed in radiology residents (pooled results) and emergency physicians (pooled results) with the difference from reading without AI assistance of 0.094 (95% CI, 0.020–0.168; p = 0.012) and 0.069 (95% CI, 0.002–0.136; p = 0.043), respectively, but not in the pediatric radiologist with the difference of 0.008 (95% CI, -0.074–0.090; p = 0.850). @*Conclusion@#A deep learning-based AI model improved the performance of inexperienced radiologists and emergency physicians in diagnosing pediatric skull fractures on plain radiographs.

11.
The Journal of Korean Academy of Prosthodontics ; : 153-163, 2021.
Article in English | WPRIM | ID: wpr-903492

ABSTRACT

Purpose@#The aim of this study was to evaluate the effects of four surface treatment methods to improve zirconia roughness and three types of resin cement on the shear bond strength (SBS). @*Materials and methods@#A total of 120 zirconia blocks were randomly divided into four surface treatments: non-treatment (Control), airborne-particle abrasion (APA) with 50 μm Al2O3 (APA50), APA with 125 μm Al2O3(APA125), and ZrO2 slurry (ZA). Three resin cements (Panavia F 2.0, Superbond C&B, and Variolink N) were applied to the surface-treated zirconia specimens. All specimens were subjected to SBS testing using a universal testing machine. The surface of the representative specimens of each group was observed by scanning electron microscope (SEM). SBS data were analyzed with oneway ANOVA, two-way ANOVA test and post-hoc Tukey HSD Test (α=.05). @*Results@#In the surface treatment method, APA125, APA50, ZA, and Control showed high shear bond strength in order, but there was no significant difference between APA125 and APA50 (P >.05). Also, ZA showed significantly higher shear bond strength than Control (P <.05). In the resin cement type, Panavia F 2.0, Superbond C&B, and Variolink N showed significantly higher shear bond strength in order (P <.05). In SEM images, the zirconia surfaces of the APA50 and APA125 showed quite rough and irregular shapes, and the zirconia surface of the ZA was observed small irregular porosity and rough surfaces. @*Conclusion@#APA and ZrO 2 slurry were enhanced the surface roughness of zirconia, and Panavia F 2.0 containing MDP showed the highest shear bond strength with zirconia.

12.
The Journal of Korean Academy of Prosthodontics ; : 173-180, 2021.
Article in English | WPRIM | ID: wpr-903490

ABSTRACT

Purpose@#The purpose of this study was to evaluate the retentive characteristics of the additional attachments used with implant bar attachment under repeated insertion/removal cycles. @*Materials and methods@#The newly developed attachment and the commercially available attachment were investigated: ADD-Lock (AL), Locator blue (LB). Two fixtures were placed parallel to each other on the custom lower mounting, and patrix of each attachment was fixed to the fixture. Also, the matrix of each attachment was placed on the opposing upper mounting. A universal testing machine was used to measure the retentive force during initial, 100, 250, 500, 1000, 2000, and 2500 repeated insertion/removal cycles. Wear and deformation of the attachment s were observed by scanning electron microscopy (SEM).Mann-Whitney U test (α=.05) and wilcoxon signed-rank test (α=.05) were performed to compare retentive force between each group and before and after 2500 repeated insertion/removal cycles. @*Results@#In terms of initial retentive force and retentive force after 2500 repeated insertion/removal cycles, the AL group (15.24 ± 1.46 N and 9.74 ± 1.16 N) showed significantly smaller values than the LB group (43.53 ± 12.39 N and 22.99 ± 4.77 N) (P <.05). Also, in the loss of retentive force, the AL group (5.50 ± 1.08 N, 36.08%) showed a smaller value than the LB group (20.54 ± 11.89 N, 47.19%) (P <.05). Based on SEM analysis, The AL group showed noticeable wear and deformation in the patrix and the LB group in the matrix. @*Conclusion@#Locator showed a higher initial retentive force than newly developed attachment, while the loss of retentive force was also higher. Both additional attachments are considered to have sufficient retentive force after repeated insertion/removal cycles.

13.
Journal of the Korean Academy of Child and Adolescent Psychiatry ; : 161-169, 2021.
Article in English | WPRIM | ID: wpr-900698

ABSTRACT

Objectives@#Adolescent suicide is a serious social problem. Adolescent alcohol use is one of the most important risk factors for adolescent suicide. This study aimed to identify the relationship between drinking habits and suicide among Korean adolescents. @*Methods@#Data from the 14th and 15th Korean Youth Risk Behavior Web-based Survey, conducted in 2018 and 2019, were used for analysis. Multiple logistic regression analysis was used to identify the relationship between drinking habits—including the age of drinking initiation, frequency of drinking, average drinking amount, frequency of drunkenness—and suicidal ideation, plans, and attempts. @*Results@#Even after adjusting for age, sex, school grade, academic achievement, socioeconomic status, depression, stress, and drinking habits, the frequencies of drinking and drunkenness increased the risk of suicide attempts. Suicide attempts were associated with the frequency of drinking in girls and middle school students, and with the frequency of drunkenness in boys and high school students. @*Conclusion@#This study identified associations between drinking habits (the age of drinking initiation, frequency of drinking, average amount of drinking, frequency of drunkenness) and suicidal behavior in adolescents. Our findings suggest that to prevent adolescent suicide, it might be necessary to investigate drinking habits, including the frequencies of drinking and drunkenness. Moreover, considering the differences in sex and school grade, it is important to include the individual group characteristics when evaluating drinking habits.

14.
Journal of Korean Medical Science ; : e73-2021.
Article in English | WPRIM | ID: wpr-899970

ABSTRACT

Background@#Puberty is a biologically and psychologically unstable period, and pubertal changes differ by sex. However, most previous studies on pubertal timing and suicide have focused on girls. This study investigated the association between early spermarche and suicide attempts in boys. @*Methods@#We analyzed a nationally representative sample of Korean adolescents (The Korea Youth Risk Behavior Web-Based Survey, KYRBS) that included approximately 35,000 boys annually from 2011 to 2015. Pubertal timing in boys was defined by spermarche. Complex sampling logistic regression analyses were performed to evaluate the odds ratios (ORs) for suicide attempts between the early and average spermarche groups. @*Results@#The ORs for suicide attempts in boys with early spermarche were significantly higher than those in boys with average spermarche after adjustment for age, perceived stress, depressive symptoms, and suicidal ideation. The ORs from 2011 to 2015 were as follows: 1.782 (P < 0.001), 1.490 (P = 0.002), 1.693 (P < 0.001), 1.541 (P = 0.001), and 1.393 (1.024– 1.895; P = 0.035), respectively. @*Conclusion@#These findings suggest that early pubertal timing is a risk factor for suicide attempts in Korean boys after adjustment for depressive symptoms, perceived stress, and suicidal ideation, which have been previously reported as risk factors for suicide attempts. Therefore, careful attention should be paid to the prevention of suicide in boys who experience early spermarche in Korea.

15.
Journal of Korean Geriatric Psychiatry ; : 43-48, 2021.
Article in English | WPRIM | ID: wpr-899684

ABSTRACT

Objective@#To investigate perceptions of coronavirus disease-19 (COVID-19) associated with anxiety caused by the COVID-19 epidemic in the elderly who are vulnerable to mental health problems. @*Methods@#This study used data of a survey on perceptions of COVID-19 and changes in mental health of 1,000 out of residents in a province of Korea in April 2020. The survey included questions about psychological perceptions for COVID-19. Subjects were dived into two groups (<60 and ≥60). Binary logistic regression analyses were performed for evaluating the association between anxiety and perceptions about COVID-19 in each group. @*Results@#Results of binary logistic regression analyses revealed that only ‘fear of getting infected myself’among perceptions for COVID-19 was associated with anxiety in the elderly aged more than 60 years. However, in adults aged less than 60 years, all perceptions for COVID-19 except impairment of performance were associated with such anxiety. @*Conclusion@#We found that the anxiety for COVID-19 in elderly with age over 60 years was associated with ‘fear of getting infected myself’ rather than ‘fear of family or people around them’, unlike adults aged less than 60 years. These results can be applied in strategies for psychological quarantine against COVID-19 among the elderly.

16.
The Journal of Korean Academy of Prosthodontics ; : 153-163, 2021.
Article in English | WPRIM | ID: wpr-895788

ABSTRACT

Purpose@#The aim of this study was to evaluate the effects of four surface treatment methods to improve zirconia roughness and three types of resin cement on the shear bond strength (SBS). @*Materials and methods@#A total of 120 zirconia blocks were randomly divided into four surface treatments: non-treatment (Control), airborne-particle abrasion (APA) with 50 μm Al2O3 (APA50), APA with 125 μm Al2O3(APA125), and ZrO2 slurry (ZA). Three resin cements (Panavia F 2.0, Superbond C&B, and Variolink N) were applied to the surface-treated zirconia specimens. All specimens were subjected to SBS testing using a universal testing machine. The surface of the representative specimens of each group was observed by scanning electron microscope (SEM). SBS data were analyzed with oneway ANOVA, two-way ANOVA test and post-hoc Tukey HSD Test (α=.05). @*Results@#In the surface treatment method, APA125, APA50, ZA, and Control showed high shear bond strength in order, but there was no significant difference between APA125 and APA50 (P >.05). Also, ZA showed significantly higher shear bond strength than Control (P <.05). In the resin cement type, Panavia F 2.0, Superbond C&B, and Variolink N showed significantly higher shear bond strength in order (P <.05). In SEM images, the zirconia surfaces of the APA50 and APA125 showed quite rough and irregular shapes, and the zirconia surface of the ZA was observed small irregular porosity and rough surfaces. @*Conclusion@#APA and ZrO 2 slurry were enhanced the surface roughness of zirconia, and Panavia F 2.0 containing MDP showed the highest shear bond strength with zirconia.

17.
The Journal of Korean Academy of Prosthodontics ; : 173-180, 2021.
Article in English | WPRIM | ID: wpr-895786

ABSTRACT

Purpose@#The purpose of this study was to evaluate the retentive characteristics of the additional attachments used with implant bar attachment under repeated insertion/removal cycles. @*Materials and methods@#The newly developed attachment and the commercially available attachment were investigated: ADD-Lock (AL), Locator blue (LB). Two fixtures were placed parallel to each other on the custom lower mounting, and patrix of each attachment was fixed to the fixture. Also, the matrix of each attachment was placed on the opposing upper mounting. A universal testing machine was used to measure the retentive force during initial, 100, 250, 500, 1000, 2000, and 2500 repeated insertion/removal cycles. Wear and deformation of the attachment s were observed by scanning electron microscopy (SEM).Mann-Whitney U test (α=.05) and wilcoxon signed-rank test (α=.05) were performed to compare retentive force between each group and before and after 2500 repeated insertion/removal cycles. @*Results@#In terms of initial retentive force and retentive force after 2500 repeated insertion/removal cycles, the AL group (15.24 ± 1.46 N and 9.74 ± 1.16 N) showed significantly smaller values than the LB group (43.53 ± 12.39 N and 22.99 ± 4.77 N) (P <.05). Also, in the loss of retentive force, the AL group (5.50 ± 1.08 N, 36.08%) showed a smaller value than the LB group (20.54 ± 11.89 N, 47.19%) (P <.05). Based on SEM analysis, The AL group showed noticeable wear and deformation in the patrix and the LB group in the matrix. @*Conclusion@#Locator showed a higher initial retentive force than newly developed attachment, while the loss of retentive force was also higher. Both additional attachments are considered to have sufficient retentive force after repeated insertion/removal cycles.

18.
Journal of the Korean Academy of Child and Adolescent Psychiatry ; : 161-169, 2021.
Article in English | WPRIM | ID: wpr-892994

ABSTRACT

Objectives@#Adolescent suicide is a serious social problem. Adolescent alcohol use is one of the most important risk factors for adolescent suicide. This study aimed to identify the relationship between drinking habits and suicide among Korean adolescents. @*Methods@#Data from the 14th and 15th Korean Youth Risk Behavior Web-based Survey, conducted in 2018 and 2019, were used for analysis. Multiple logistic regression analysis was used to identify the relationship between drinking habits—including the age of drinking initiation, frequency of drinking, average drinking amount, frequency of drunkenness—and suicidal ideation, plans, and attempts. @*Results@#Even after adjusting for age, sex, school grade, academic achievement, socioeconomic status, depression, stress, and drinking habits, the frequencies of drinking and drunkenness increased the risk of suicide attempts. Suicide attempts were associated with the frequency of drinking in girls and middle school students, and with the frequency of drunkenness in boys and high school students. @*Conclusion@#This study identified associations between drinking habits (the age of drinking initiation, frequency of drinking, average amount of drinking, frequency of drunkenness) and suicidal behavior in adolescents. Our findings suggest that to prevent adolescent suicide, it might be necessary to investigate drinking habits, including the frequencies of drinking and drunkenness. Moreover, considering the differences in sex and school grade, it is important to include the individual group characteristics when evaluating drinking habits.

19.
Journal of Korean Medical Science ; : e73-2021.
Article in English | WPRIM | ID: wpr-892266

ABSTRACT

Background@#Puberty is a biologically and psychologically unstable period, and pubertal changes differ by sex. However, most previous studies on pubertal timing and suicide have focused on girls. This study investigated the association between early spermarche and suicide attempts in boys. @*Methods@#We analyzed a nationally representative sample of Korean adolescents (The Korea Youth Risk Behavior Web-Based Survey, KYRBS) that included approximately 35,000 boys annually from 2011 to 2015. Pubertal timing in boys was defined by spermarche. Complex sampling logistic regression analyses were performed to evaluate the odds ratios (ORs) for suicide attempts between the early and average spermarche groups. @*Results@#The ORs for suicide attempts in boys with early spermarche were significantly higher than those in boys with average spermarche after adjustment for age, perceived stress, depressive symptoms, and suicidal ideation. The ORs from 2011 to 2015 were as follows: 1.782 (P < 0.001), 1.490 (P = 0.002), 1.693 (P < 0.001), 1.541 (P = 0.001), and 1.393 (1.024– 1.895; P = 0.035), respectively. @*Conclusion@#These findings suggest that early pubertal timing is a risk factor for suicide attempts in Korean boys after adjustment for depressive symptoms, perceived stress, and suicidal ideation, which have been previously reported as risk factors for suicide attempts. Therefore, careful attention should be paid to the prevention of suicide in boys who experience early spermarche in Korea.

20.
Journal of Korean Geriatric Psychiatry ; : 43-48, 2021.
Article in English | WPRIM | ID: wpr-891980

ABSTRACT

Objective@#To investigate perceptions of coronavirus disease-19 (COVID-19) associated with anxiety caused by the COVID-19 epidemic in the elderly who are vulnerable to mental health problems. @*Methods@#This study used data of a survey on perceptions of COVID-19 and changes in mental health of 1,000 out of residents in a province of Korea in April 2020. The survey included questions about psychological perceptions for COVID-19. Subjects were dived into two groups (<60 and ≥60). Binary logistic regression analyses were performed for evaluating the association between anxiety and perceptions about COVID-19 in each group. @*Results@#Results of binary logistic regression analyses revealed that only ‘fear of getting infected myself’among perceptions for COVID-19 was associated with anxiety in the elderly aged more than 60 years. However, in adults aged less than 60 years, all perceptions for COVID-19 except impairment of performance were associated with such anxiety. @*Conclusion@#We found that the anxiety for COVID-19 in elderly with age over 60 years was associated with ‘fear of getting infected myself’ rather than ‘fear of family or people around them’, unlike adults aged less than 60 years. These results can be applied in strategies for psychological quarantine against COVID-19 among the elderly.

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