Odds ratio (OR) and 95% confidence interval (CI) for obesity risk by quintiles (Q1-Q5) of sodium intake with energy adjustment (residual-Na) were estimated in total children.

<p>The dietary sodium intakes increases, the risk of obesity significantly increases in obesity group (black bar; P-<i>trend</i> < 0.05), not in overweight group (gray bar). This figure was shown by comparison with the 1^st quintile vs all the others combined. Multivariate logistic regression models after adjustment for age, sex, mother’s BMI, father’s BMI, and education levels (<10 years, 10~12, 13~16 years, and >16 years) of the mother and father, dietary fat, systolic blood pressure and regular physical activity (no, yes). Means of residual-Na in each quintile for total subjects are 2287.6, 2998.9, 3496.8, 4044.9 and 5058.9 mg/day.