Sedentary behavior during leisure time, physical activity and dietary habits as risk factors of overweight among school children aged 14-15 years: case control study.

School based case-control study was conducted during September to November 2013 including 176 overweight children as cases and 704 children with normal weight as controls. Cases were defined as body mass index for age and sex of ≥ +1SD and controls as those in the range of -2SD to +1SD. Validated instruments were used for data collection. Multiple logistic regression was applied and results were expressed with adjusted odds ratios (OR) and 95% confidence intervals (CI). Risk factors for overweight were insufficient physical activity (OR 1.6, 95% CI 1.1-2.4), watching video/DVD ≥ 2 h (OR 3.1, 95% CI 1.8-5.3), watching television ≥ 2 h (OR 2.6, 95% CI 1.7-3.8) and doing homework ≥ 2 h, (OR 1.8, 95% CI 1.2-2.7). Consuming meat (OR 1.9, 95% CI 1.2-3.1), fish or other sea foods (OR 1.6, 95% CI 1.1-2.8), fast food/fried rice/oily foods (OR 1.9, 95% CI 1.2-2.9), carbonated drinks or sugary drinks (OR 1.9, 95% CI 1.2-2.8), sweets, cookies or ice cream (OR 1.8, 95% CI 1.2-2.9) were dietary risk factors for overweight. Consuming legumes and seeds (OR 0.50, 95% CI 0.3-0.7), vegetables and fruits (OR 0.6, 95% CI 0.4-0.9) were protective factors for overweight.