• Nutrition Research and Practice
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• v.18 no.2
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• pp.269-281
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• 2024

BACKGROUND/OBJECTIVES: The objective of this study was to compare dietary habits and mental health among middle school students in urban and rural areas based on bedtime, and to provide evidence supporting appropriate bedtime for Korean middle school students in relation to their healthy dietary habits and mental well-being. SUBJECTS/METHODS: The study population consisted of 25,681 second-year middle school students who participated in the Korea Youth Risk Behavior Survey in 2020-2022. Participants were asked about their bedtime and wake-up time during the past 7 days and were classified into five categories. The study compared the general characteristics, academic factors, dietary habits, and mental health of urban and rural students based on their bedtime. RESULTS: Bedtime was found to be later in the following order: urban female students, rural female students, urban male students, and rural male students. As bedtime got later, the rates of smoking and alcohol consumption increased. Students who went to bed before 11 p.m. had lower academic performance, while rural male students who went to bed after 2 a.m. had lower academic performance. Later bedtime was associated with increased smartphone usage, skipping breakfast, consuming fast food, and drinking carbonated beverages. Later bedtime was also associated with higher perceived stress levels, particularly among students who went to bed after 2 a.m., higher rates of suicidal ideation, experiencing sadness and despair, as well as the prevalence of clinically significant anxiety disorders. CONCLUSION: These results suggest that middle school students who go to bed too late have higher rates of smoking and alcohol drinking, as well as unhealthy eating habits, stress, suicidal ideation, sadness, and anxiety. Therefore, it is necessary to provide educational and social institutional support to promote adequate sleep for the health of adolescents.

• Korean Journal of Community Nutrition
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• v.8 no.3
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• pp.270-279
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• 2003

Middle and high school students in Korea spend a lot of time at school. In other words, many Korean teenagers spend most of their time studying, and have little time for other activities, such as physical workouts. Fewer physical activities, and consumption of many snacks, etc. may lead to overweight or obesity in some teenagers. This study was conducted to find out the activity levels of teenagers' in order to calculate their daily energy expenditures. A total of 1,192 students (461 middle school students and 731 high school students) who lives in either a city or a country area were recruited for this study. One-day Activity Diaries were collected using questionnaires and analyzed by means of SPSS /win. The participating students spent about 7 hours 24 minutes resting including sleeping; 6 hours 28 minutes studying ,4 hours 4 minutes in leisure activities , 1 hour 32 minutes in personal hygiene activities such as washing, dressing and undressing, etc., 50 minutes on transportation : and 23 minutes on household chores such as cleaning, doing the laundry, etc. The average activity factor was 1.49. That of middle school female students was the lowest at 1.47, followed by middle school male students at 1.48, high school female students at 1.49, and high school male students at 1.51. The daily energy expenditure of middle and high school male students was 2,289 kcal and 2,600 kcal, respectively. That of female students was 1,959 kcal and 2,067 kcal, respectively.

• Women's Health Nursing
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• v.6 no.2
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• pp.316-329
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• 2000

The purpose of this study is to identify various predictors of smoking behavior among female adolescents. Data for this study was collected from 357 students enrolled in a female high school, a coeducational high school, and a vocational high school in Seoul from 1st to 20th July 1999 and this data was analysed based on descriptive statistics and logistic regression with the SAS program. The results were as follows: 1. The proportion of current smokers was 17.9% and experienced smokers was 34.2% in girl high schools. 2. According to the factors family, school, peer, social learning, and psychological factors, the predictable variables are lack of family attachment and function in family factors, school involvement in school factors, associating with smokers among peers and modeling and differential reinforcement of smoking in social learning factors, self-assertiveness, self-esteem, and depression in psychological factors. 3. According to all the factors, the main predictors were peer association, differential reinforcement of smoking, and lack of family attachment. These variables cause 48.4% of smoking behavior. To prohibit smoking among female students, this society should develop a program to focus on peer leadership about quitting smoking, acquirement of skills of refusal for smoking, counter conditioning, reinforcement management, and support system about nonsmoking.

• Journal of the Korean Home Economics Association
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• v.37 no.11
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• pp.1-17
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• 1999

The purpose of this study was to investigate 1) the effects of clothing styles on impression formation of middle and high school students and 2) the differences in impression in relation to perceiver variablex(sex, age, residence). The sample consisted of 60 subjects in each of 8 perceiver groups according to sex, age and residence. Stimuli consisted of 10 color photographs of male and female adolescent wearing each of 5 clothing styles respectively. Questionnaires consisted of 43 seven-point semantic differential scales measuring perceivers responses to the stimuli, open-ended Question and perceiver’s clothing style preference. Responses to the semantic differential scale were factor analyzed and 4 factors - Self-confidence/refinement, Sincerity, Intelligence, and Sociability - were emerged to account for the structure of the impression of the male stimuli. Five factors - Sincerity, Refinement, Self-confidence, Sociability, Intellience - were emerged in case of female stimuli. One-way ANOVA results showed that clothing styles had the effects on all the factors of impression except Sincerity. From the reset analyzing the effects of perceiver variables on impressions, age had the effects in all the clothing styles, sex had the effects in 6 clothing styles, and residence in 5 clothing styles. Clothing style 5(male stimuli) and style 10(female stimuli) were the most preferred clothing style in all the subject groups.

• The Journal of the Korea Contents Association
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• v.20 no.7
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• pp.107-117
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• 2020

Animation films form a substantial part of pop culture and depict the sociocultural changes and values of the time in which they are made through visual expression of story and characters. In the process of appreciating animation films and accepting the characters, the audience learns the gender role behaviors that appear in the works as socially acceptable representations of men and women. This study illustrates whether the expression of gender role and behaviors of characters from animation films have changed over time or not by analyzing the costume and gestures of the female protagonists in 'Mulan', 'Tangled', 'Moana', and 'Frozen 2'. These films are considered to reflect the modern female identity on their story and characters. The study confirms that the stereotypical gestures and behaviors of women are still used today to portray the female protagonists in the animation films contrary to the story composition and various aspects of characters which escaped the formal stereotype. It is important for children and adolescents, the main consumers of animation, to learn and know how to consume media properly. Thus, this study seeks to illuminate the importance of research on animation literacy eduction for children and adolescents by examining the visual expressions and their implications in various animation films.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.31 no.4
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• pp.214-224
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• 2020

Objectives: This study aimed to examine the trend in diagnostic prevalence of psychiatric disorders in children and adolescents. Methods: Individuals aged 0-18 years were included in the study based on the National Health Insurance Claims Data. To investigate the trends in diagnosis and diagnostic prevalence of psychiatric disorders reflecting the decrease in the birth rate, data were analyzed from 2010 as a reference year to 2015. Results: The number of patients diagnosed with psychiatric disorder decreased annually, from 23,412 on 2010 to 18,821 on 2015. The most common disorder was hyperkinetic disorder in male and depressive episode in female. Although there was no significant change in overall diagnostic prevalence rate of psychiatric disorders, age groups <10 years and some disorders had significant changes in prevalence rate. This study classified the diagnostic prevalence by age into two unique patterns: group in which the diagnosis rate increases with age and group in which the diagnosis rate peaks at a certain age and then decreases. Conclusion: Diagnostic prevalence of psychiatric disorders was different according to age and sex. These patterns should be reflected in the formulation of policies related to mental health and in medical practice for pediatric patients. It is urgent to identify how these patterns change in young adults.

• Korean Journal of Human Ecology
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• v.15 no.6
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• pp.891-903
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• 2006

The purpose of this study was to identify relationships among peer pressure, parental supervision, alcohol expectancy and adolescent drinking behaviors between year 2001 and 2006. Three hundred high school students were given questionnaires each year on their drinking behavior. Findings of this study were; first, a adolescent drinking and the amount drinking has increased during the years. adolescent drinker ratio as adolescent drinkers were 91.3% in 2006 compared to 75.9% in 2001. The average drinking amounts were 40.82 units in 2006 and 24.9 units in 2001. Second, differences were found in adolescent drinking behaviors such as the amount of alcohol consumption, drinking frequency, & problem drinker ratio by gender, and grade. Male students over female students. Third, peer pressure, parental supervision, alcohol expectancy showed significant impacts on adolescent drinking behaviors through 2001 and 2006. Students who lack parental supervision with much higher drinking-related peer pressure along with a higher level of positive alcohol expectancy were observed to be heavy drinkers and problem drinkers. Especially, students who showed belief in alcohol's tension-relieving function and sociability function tended to over-drink, drink more frequently and as a result, experienced more drinking problems. Intervention strategies were discussed.

• The Journal of Pediatrics of Korean Medicine
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• v.24 no.2
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• pp.49-58
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• 2010

Objectives This study was performed to investigate the effects of obesity, food, physical activity and stress on blood pressure changes for children and for adolescents. Methods The participants were the first and the fourth grade elementary school students and the first grade of middle school students. They were asked to measure the blood pressure, height, weight and were asked to complete questionnaires. Results The systolic and diastolic blood pressure of male was significantly higher than that of female and the prevalence of hypertension among the first and the fourth grade elementary school students and the first grade of middle school students were 15.6%, 13.6%, and 7.8%, respectively. Height, weight and body mass index (BMI) were highly correlated with the level of blood pressure. However, food, and physical activity, stress and depression were poorly correlated with the level of blood pressure. Conclusions This study proved that blood pressures in children and in adolescent were closely related with obesity, sex, and height.

• Child Health Nursing Research
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• v.26 no.1
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• pp.98-106
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• 2020

Purpose: This study utilized data from the Korean National Health and Nutrition Examination Survey (KNHANES) to explore differences in the timing of menarche in Korean girls according to blood heavy metal concentrations. Methods: This study performed a secondary analysis of cross-sectional data from the sixth KNHANES. Data from 179 female children and adolescents aged 10~18 were included in this study. The relationships of blood heavy metal concentrations (lead, mercury, and cadmium) with age of menarche were analyzed using complex sample multiple logistic regression. Results: In the participants of this study, the geometric mean values of blood lead, mercury, and cadmium concentrations were 1.15±0.04 ㎍/dL, 1.80±0.08 ㎍/L, and 0.30±0.03 ㎍/L, respectively. Mercury poisoning (>5 ㎍/L) was found in 1.5% of participants. Furthermore, significant relationships were found between blood lead and mercury concentrations and age at menarche (p for trend: p<.001 and p=.015, respectively). Conclusion: Through an analysis of national big data, this study found evidence that Korean girls showed a younger age at menarche in response to higher blood lead and mercury concentrations. To prevent and manage precocious puberty in Korean children and adolescents, a systematic policy that monitors both exposure to environmental hazards and blood heavy metal concentrations is needed.

• Korean Journal of Child Studies
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• v.36 no.2
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• pp.39-54
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• 2015

The purpose of this study was to examine the impact of parenting attitudes on writing vicious internet replies and the viewing of internet pornography. This study utilized logistic and multiple regression analyses of the 5th wave(2nd grade in middle school) data from the Korean Youth Panel Study(KYPS), as administered by the National Youth Policy Institute. The results of this study can be summarized as follows: First, parenting attitudes were found to decrease the writing of vicious internet replies and the viewing of internet pornography. Second, there was a significant gender difference in the effect of parenting attitudes. As for male adolescents, parental monitoring was more important in the decrease in writing vicious internet replies and the viewing of internet pornography than parental attachment. In contrast, for female adolescents, parental attachment was more important in decreasing the viewing of internet pornography than parental monitoring. On the basis of these results, several implications for youth welfare practice and policy were suggested.