• Journal of Preventive Medicine and Public Health
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• v.43 no.5
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• pp.396-402
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• 2010

Objectives: Self-reported anthropometric values, such as height and weight, are used to calculate body mass index (BMI) and assess the prevalence of obesity among adolescents. The aim of this study was to evaluate the validity of selfreported height, weight, and BMI of the Korea Youth Risk Behavior Web-based Survey questionnaire. Methods: A convenience sample of 137 middle school students and 242 high school students completed a selfadministered questionnaire in 2008. Body height and weight were directly measured after self-reported values were obtained from the questionnaire survey. Sensitivity, specificity, and kappa statistics were computed in order to evaluate the validity of the prevalence of obesity (BMI $\geq$ 95th percentile or $\geq$ $25;kg/$m^2$) based on self-reported data. Results: Self-reported weight and BMI tended to be underestimated. Self-reported height tended to be overestimated among middle school females and high school males. Obese adolescents tended to underestimate their weight and BMI and overestimate their height more than non-obese adolescents. The prevalence estimate of obesity based on selfreported data (10.6%) was lower than that based on directly measured data (15.3%). The estimated sensitivity of obesity based on self-reported data was 69.0% and the specificity was 100.0%. The value of kappa was 0.79 (95% confidence interval, 0.70 - 0.88). Conclusions: This study demonstrated that self-reported height and weight may lead to the underestimation of BMI and consequently the prevalence of obesity. These biases should be taken into account when self-reported data are used for monitoring the prevalence and trends of obesity among adolescents nationwide.

• International Journal of Human Ecology
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• v.12 no.2
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• pp.13-24
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• 2011

This study compared actual weight with perceived weight, described the prevalence of unhealthy weight control behavior, determined the differences in psychological and personal variables between participants that reported unhealthy weight control behavior and those who did not, and examined the relationship of eating habits to unhealthy weight control behavior for Korean adolescents. The study population consisted of a nationally representative sample of middle and high school students who completed the Fifth Korea Youth Risk Behavior Web-based Survey (KYRBWS): Fifth in 2009. Among the 75,066 participants of KYRBWS, 35,473 (n = 18,851 girls and 16,622 boys) were eligible for a research focused on unhealthy weight control behavior. The results of this research were as follows: First, there were considerable discrepancies (45.1% of girls and 32.8% of boys) between the perceived weight and the actual weight. Second, overall, unhealthy weight control behavior was more prevalent in girls and fasting was the most commonly reported behavior. Third, participants that reported unhealthy weight control behavior scored significantly lower on scaled measures of happiness, health, academic achievement, and economic status; in addition, they scored higher on stress measures. Fourth, girls and boys shared common protective factors of having breakfast and vegetables more often, perceiving their weight as underweight rather than overweight, and having a correct weight conception. Protective factors unique to girls were having lunch and dinner more often. Girls and boys shared common risk factors of the consumption of soda, fast food, instant noodles, and snacks more often, while consumption of fruit more often was a risk factor only for girls. The improvement of protective factors and minimization of risk factors through Home Economics classes (and other classes relevant to health) may mitigate unhealthy weight control behavior of adolescents.

• Research in Community and Public Health Nursing
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• v.29 no.4
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• pp.476-487
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• 2018

Purpose: The present study is focused on understanding weight perception related with individual- and school-level multifactorial origins, underestimated and overestimated respectively, in normal body weight adolescents. Methods: Using the 2017 Korea Youth Risk Behavior Web-based Survey data of 45,902 students from 799 secondary schools, a multilevel multinomial logistic regression analysis was performed where adolescents (level1) were nested within schools (level 2). Results: At the school level, the average school body mass index (BMI, $kg/m^2$) and physical education were associated with weight perception among both boys and girls. In boys, geographic areas were associated with weight underestimation. At the individual level, perceived economic status, weekly allowance, BMI ($kg/m^2$), smartphone usage time (hrs/day) and perceived stress were associated with weight perception among both boys and girls. Age, paternal education, academic achievement and alcohol use were associated with weight perception among girls, while part-time job and physical activity were associated with weight perception among boys. Conclusion: Our findings underscore the importance of individual- and school-level environments in developing correct weight perception and have implications for school health education to establish healthy lifestyle behaviors for all adolescents.

• The Journal of Korean Society for School & Community Health Education
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• v.22 no.3
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• pp.1-15
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• 2021

Objectives: The purpose of this study was to examine whether demographic and socio-economic characteristics, health behaviors are related overweight and obesity in Korean adolescents. Methods: Data from the 15^th Korea Youth Risk Behaviors web-based Survey(KYRBWS) administered in 2019 were analyzed: 60,100 students in middle and high school participated in the survey. But except 1,555 missing value, 55,748 students were analyzed. It was conducted frequency analysis, Rao-Scott chi-square test and multiple logistic regression analysis. Results: The significant influencing factors on overweight and obesity of adolescents were gender, economic status, father's educational background, alcohol experience, fastfood consumption, muscle strengthening exercise, stress perception(p<.001). The odds ratio for overweight and obesity of male adolescents compared to female adolescents were 1.19(p<.001). and The odds ratio for overweight and obesity of perceived stress adolescents compared to those who without stress were 1.13(p<.001). Conclusions: I found that adolescents' some undesirable health behaviors affect their overweight and obesity, I recommend that school health promotion programmes should be implemented in schools to form good health behaviors such as healthy eating habits, physical exercise and managing stress.

• Research in Community and Public Health Nursing
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• v.26 no.3
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• pp.190-198
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• 2015

Purpose: This study aimed to compare health risk behaviors among adolescents according to whether or not the parents were born in South Korea. Methods: From the database of the ninth Korea Youth Risk Behavior Web-based Survey (KYRBS), the researchers classify adolescents into four groups: those whose parents were both native Korean, those whose mother only was a native Korean, those whose father only was a native Korean, and those whose parents were both foreign-born. Data were analyzed using ${\chi}^2$-test and multiple logistic regression with the SPSS/WIN 18.0 program. Results: The adolescents with a foreign-born mother were less likely to smoke and drink alcohol than those with native Korean parents, but for other health risk behaviors the two groups were similar to each other. The adolescents with a foreign-born father were at a greater risk of drug use, intercourse, depression and violence at school than those with native Korean parents. The adolescents whose parents were born abroad were at a greater risk of smoking, drug use, intercourse, depression, suicidal ideation and violence at school than those with native Korean parents. Conclusion: Health promotion approaches differentiated by the type of multi-cultural family are needed in order to improve multi-cultural adolescents' health.

• Korean Journal of Health Education and Promotion
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• v.31 no.3
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• pp.39-50
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• 2014

Objectives: The purpose of this study is to examine the factors for self-rated health by gender in South Korean adolescents. Methods: The population consisted of a nationally representative sample of adolescents(n= 37,414 boys, 37,522 girls) in middle and high school who completed the Korea Youth Risk Behavior Web-based Survey(KYRBWS) in 2011. Using logistic regression analysis, self-rated health was regressed on all predictors, including socioeconomic factors, behavioral and psychological factors. All analysis were conducted according to gender. Results: Girls showed more negative self rated health than boys (respectively 28.4%, 40.7%). Adolescent perceptions of health was associated with socioeconomic status, behavioral and psychological factors. Logistic regression analysis revealed that physical activity, body weight perception, despair, level of happiness and stress were the main influencing factors. Conclusions: The findings show that adolescent perceptions of their health are associated with overall sense of functioning, which are associated with health behaviors and psychological factors. Further interventions that focus on improving health behaviors and psychological health may make adolescents more healthy.

• Journal of dental hygiene science
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• v.22 no.3
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• pp.171-179
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• 2022

Background: In this study, we investigated the changes and factors that affect daily health behaviors due to COVID-19 among adolescents. We intend to provide basic data so that a systematic and comprehensive health education program that includes physical and oral health can be made. Methods: This study was a secondary data analysis of the from the 2019 and 2020 Korea Youth Risk Behavior Web-based Survey. A final sample of 112,251 participants was anlayzed using chi-square test, and ordinal logistic regression. Results: In the case of tooth brushing, the frequency of 'never' increased in most general characteristics compared to before COVID-19. In the case of handwashing, it was found that handwashing behavior increased (increased) after COVID-19 compared to before COVID-19. As a result of confirming the factors affecting tooth brushing behavior before and after COVID-19, it was found that girls brushed teeth 2.2 times more regularly after lunch than boys. As a result of adjusting all other factors, regular tooth brushing behavior after COVID-19 was reduced by 0.79 times compared to before COVID-19. Conclusion: It is judged that it is necessary to operate a comprehensive health management program in the school so that the most basic tooth brushing for oral health and handwashing for health can become a habit. In addition, by confirming the impact of the COVID-19 pandemic on handwashing and tooth brushing behavior through this study, it is expected to be used in the development of policy data such as raising awareness of brushing and improving behaviors applicable in the current and upcoming new pandemic situations.

• Clinical and Experimental Pediatrics
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• v.64 no.9
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• pp.443-458
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• 2021

In Korea, several national cross-sectional surveys monitor the diet, nutritional status, and health status of children. This continual dedicated national surveillance system contributes to the identification of nutritional and health issues, establishment of public health policies, and development of nutrition recommendations. This paper provides recent information about the Korea National Health and Nutrition Examination Survey and the Korean Youth Risk Behavior Web-based Survey and describes key nationwide survey findings published in the last 5 years on infant feeding practices and the dietary intake and nutritional status of Korean infants, children, and adolescents. There have been increasing trends in children, and teenagers who skip breakfast, eat fast food, consume sugary drinks, have vitamin D deficiency, and are obese. This review will inform pediatricians, nutritionists, and other health care practitioners who track children's growth and development. It may also help researchers and policymakers identify diet-related policies and strategies for chronic disease prevention in Korean infants, children, and adolescents.

• Journal of Korean society of Dental Hygiene
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• v.17 no.4
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• pp.669-680
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• 2017

Objectives: The objective of this study was to investigate the correlation between demographic factors and oral health factors and mental health factors in Korean adolescents. Methods: The study was based on the 11th Korea Youth Risk Behavior Web-Based Survey (2015). The final participation rate in the survey was 96.7%. of a total of 70.362 adolescents (age, 12~18 years) who had participated in the survey, 68,043 adolescents were selected for analysis. Results:As a result of examining the stress awareness of adolescents and the experience of oral disease symptoms, it was found that the number of brushing times per day was less than 1 time (p<0.001), tingling and throbbing (p<0.001), gum pain & blood (p<0.001) and bad breath (p<0.001) were more stressed than those who had experience. On the other hand, the lack of experience in oral health education was more stressful (p<0.001). As a result of examining the factors influencing subjective happiness, it was found that the female, the lower the grade, the higher the academic performance and economic level, the less experience of oral disease in the last one year, The level of awareness was high. Conclusions: These results indicate that the demographic factors, mental health factors, and oral health factors of adolescents are correlated to one another. Therefore, when developing a program for promoting adolescent health or establishing a national business plan, it should be considered in a multi-faceted way.

• Research in Community and Public Health Nursing
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• v.28 no.3
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• pp.240-250
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• 2017

Purpose: In South Korea, suicide mortality has rapidly increased, so it has become a major public health concern. Multicultural adolescents are regarded as a high-risk group due to their situation. In this study, we compared the prevalence and risk factors of suicide ideation between Korean and multicultural adolescents. Methods: Data from the eleventh Korean Youth Risk Behavior Web-based Survey (2015), collected by the Korean Centers for Disease Control and Prevention, were statistically analyzed using the descriptive statistics and multivariate logistic regression. The total participants were 63,376 in numbers. They were composed of 62,649 (98.9%) Korean and 727 (1.1%) multicultural adolescents. Results: I found that the prevalence of suicide ideation was significantly higher among the multicultural adolescents (15.8%) compared with those of Korean (11.3%). The risk factors of suicide ideation in the Korean group were co-residence without family, poor perceived health status, depressive mood, high stress level, poor perceived happiness level, and experience of violence. Conversely, the risk factors of the multicultural group were smoking, depressive mood, and experience of violence. Conclusion: These findings suggest that appropriate and practical prevention strategies should focus on psychological and environmental factors in order to prevent suicide ideation and reduce suicide behavior in Korean and multicultural adolescents.