Table 3.
Body mass indices, z scores (standard deviation scores), and mean percentages >91st centile at baseline and 12 months
| Characteristic | Control clusters (n=14) | Intervention clusters (n=15) | Mean difference (95% CI) |
|---|---|---|---|
| Baseline*: | |||
| Mean (SD) body mass index | 17.6 (0.7) | 17.4 (0.6) | 0.0 (−0.5 to 0.5) |
| Mean (SDS) z score† | 0.47 (0.2) | 0.50 (0.23) | −0.03 (−0.2 to 0.13) |
| Mean percentage >91 st centile (z score >1.34) | 19.4 (8.4) | 20.3 (6.3) | −0.9 (−6.6 to 4.8) |
| 12 months*: | |||
| Mean (SD) body mass index | 18.3 (0.8) | 17.9 (0.7) | 0.4 (−0.2 to 1.0) |
| Mean (SDS) z score | 0.60 (0.19) | 0.48 (0.23) | 0.12 (−0.04 to 0.28) |
| Mean percentage >91 st centile (z score >1.34) | 26.9 (12.3) | 20.1 (6.7) | 6.8 (−0.7 to 14.3) |
| Change over 12 months‡: | |||
| Mean (SD) body mass index | 0.8 (0.3) | 0.7 (0.2) | 0.1 (−0.1 to 0.3) |
| Mean z score | 0.08 (0.13) | 0.04 (0.07) | 0.04 (−0.04 to 0.12) |
| Mean percentage >91 st centile | 7.5 (8.0) | −0.2 (6.3) | 7.7 (2.2 to 13.1) |
*
Based on maximum number of children in each cluster.
†
Age and sex specific body mass index converted to standard deviation score using revised 1990 reference standards.
‡
Based on children with data at baseline and 12 months.