Fig. 2From: Dental caries is negatively correlated with body mass index among 7-9 years old children in Guangzhou, ChinaRestricted cubic spline regression for the association between BMI-for-age Z-score and the odds for the prevalence of primary dental caries. Solid line, odds ratio; dashed line, 95 % confidence interval. Knots were placed at Z-score = -2,-1, 0, 1, 2. The reference value was Z-score = 0. The model was adjusted age and sexBack to article page