This exploratory cross-sectional study examined screen time, sedentary behavior, Nutrition Quotient (NQ) and weight status among 221 elementary, middle and high school students in Chungbuk, Korea. Weight status was recalculated from self-reported height and weight using the sex- and assumed-age-in-months-specific body mass index LMS values of the 2017 Korean National Growth Charts. Groups were compared using Kruskal-Wallis and Fisher’s exact tests, and associations with weight status were estimated by binary and ordinal logistic regression adjusted for sex and school level, with Bonferroni correction for multiple testing. Total screen time increased across school levels (elementary 220.8, middle 390.4, high 418.7 min/day; p<0.001), whereas sedentary time did not differ. Overweight and obesity combined affected 29.0% of the students and increased with school level (p=0.007). Total screen time differed by weight status (p=0.002) and showed an increasing trend across categories (p<0.001), but this association was attenuated after adjustment and no longer significant; school level was the dominant correlate (high vs elementary, p=0.005). NQ was not associated with weight status. The apparent association between screen time and weight status appears to be largely explained by school level and should be regarded as hypothesis-generating.

Abstract
서 론
연구대상 및 방법
    1. 조사대상 및 기간
    2. 조사내용 및 방법
    3. 통계분석
결과 및 고찰
    1. 조사대상자 일반사항
    2. 주요 변수 기초통계 분석 결과
    3. 비만도 분포 현황
    4. 비만도에 따른 영상기기 사용시간, 좌식시간 차이 분석결과
    5. 비만도에 따른 영양지수(NQ) 분포
    6. 주요 변수 간 상관관계 분석 결과
    7. 비만도 관련 요인에 대한 회귀분석 결과
요약 및 결론
감사의 글
References

• 신유리(원광대학교 외식조리과 조교수) | Yulee Shin (Assistant Professor, Dept. of Food Service Culinary, Wonkwang University, Iksan 54538, Korea)
• 신혜원(가천대학교 식품영양학과 연구교수) | Hyewon Shin (Research Professor, Dept. of Food and Nutrition, Gachon University, Seongnam 13120, Korea)
• 이호진(한국교통대학교 식품영양학전공 부교수) | Hojin Lee (Associate Professor, Dept. of Food and Nutrition, Korea National University of Transportation, Jeungpyeong 27909, Korea) Corresponding author