In all analyses we controlled for baseline values and clustering.
After adjustment for age, gender, HbA1c, smoking status, use of drugs known to affect weight (for example, oral hypoglycaemic agents, diuretics), baseline values, and clustering, there was a −1.26 kg (95% CI −2.19 to −0.34) difference in weight between the intervention arm and the control arm at 12 months.
For each outcome measure, we report the size of the intervention effect as the difference in its average z scores at follow-up between the intervention and control groups after adjustment for grade, sex, baseline values, and clustering within school classes.
After adjustment for grade, sex, baseline values, and clustering within classes, children in the intervention arm compared with controls showed more negative changes in the z score of the sum of four skinfolds (−0.12, 95%% confidence interval −0.21 to −0.03; P=0.009).
After adjustment for baseline value and cluster, four of the five illness belief scores (coherence, timeline, personal responsibility, and seriousness) differed significantly at three years.
All models adjusted for sex, age, ethnicity, primary language in the home, baseline value, and clustering by community.
Significance was lost in mixed models adjusted for baseline value and cluster-effects (adjusted mean difference -0.03 (95% CI -0.15; 0.09, p = 0.607).
A univariate regression analysis was performed for each outcome variable for all 250 imputed cases, adjusted for baseline values and the clustering effect of school.
Between group differences at 12 months were analysed using linear regression on complete data, with the variable of interest at 12 months as the outcome variable adjusted for baseline values and the clustering effect of schools.
Results All analyses were adjusted for baseline values and the possible clustering effect.
