Intraclass correlation (ICC): | Min. n estimate | Max. n estimate | |||
---|---|---|---|---|---|
Control | 0.0396 | 0.0443 | |||
Intervention | 0.0000 | 0.0000 | |||
Estimate | SE | 95% CI | P value | ||
Analysis at the centre level: | |||||
Outcome = final BMI z-score – baseline BMI z-score | |||||
Control | 0.55 | 0.12 | 0.16 | 0.94 | |
Intervention | −0.17 | 0.10 | −0.49 | 0.16 | |
Change difference (centres paired) | 0.72 | 0.21 | 0.04 | 1.40 | 0.043 |
Change difference (centres unpaired) | 0.72 | 0.16 | 0.33 | 1.10 | 0.004 |
Analysis at the child level: | |||||
Outcome = final BMI z-score – baseline BMI z-score, assuming ICC = 0 | |||||
Control | 0.56 | 0.10 | 0.35 | 0.77 | |
Intervention | −0.18 | 0.15 | −0.48 | 0.11 | |
Change difference (centres unpaired) | 0.74 | 0.18 | 0.38 | 1.10 | < 0.001 |
Outcome = final BMI z-score – baseline BMI z-score, assuming ICC > 0 | |||||
Centre level variance | 0.00 | 0.00 | |||
Child level variance | 0.70 | 0.11 | |||
Change difference (centres unpaired) | 0.74 | 0.19 | 0.37 | 1.11 | < 0.001 |
Outcome = final BMI z-score, baseline BMI z-score as covariate, assuming ICC > 0 | |||||
Centre level variance | 0.00 | 0.00 | |||
Child level variance | 0.47 | 0.07 | |||
Baseline BMI z-score | 0.60 | 0.06 | |||
Change difference (centres unpaired) | 0.49 | 0.16 | 0.17 | 0.80 | 0.002 |