Table 1.
Number of study subjects and time trends in mean body weight, height and BMI among representative samples of children aged 7·5–9·5 years, Tuscany region, Italy
| 2002 | 2006 | 2008 | 2010 | 2012 | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | sd | Mean | sd | Mean | sd | Mean | sd | Mean | sd | P for trend† (2002 to 2012) | |
| Number of subjects | |||||||||||
| Boys (N 3711) | 776 | 713 | 734 | 741 | 747 | ||||||
| Girls (N 3472) | 709 | 692 | 641 | 683 | 747 | ||||||
| Body weight (kg) | |||||||||||
| Boys | 32·4 | 7·2 | 32·7 | 6·8 | 33·2 | 6·9 | 33·1 | 7·4 | 33·2 | 6·9 | 0·012 |
| Girls | 31·6 | 7·0 | 31·9 | 6·5 | 32·2 | 6·8 | 32·2 | 6·8 | 31·8 | 6·5 | 0·394 |
| All | 32·0A | 7·1 | 32·3 | 6·7 | 32·7A | 6·9 | 32·7 | 7·2 | 32·5 | 6·7 | 0·02 |
| Height (cm) | |||||||||||
| Boys | 133·5a,b | 5·9 | 133·6c,d | 5·6 | 134·6a,c | 5·9 | 134·3 | 6·0 | 135·1b,d | 6·0 | <0·001 |
| Girls | 132·5a,b,c,d | 6·1 | 132·6e,f,g | 5·9 | 133·6a,e | 6·3 | 133·8b,f | 6·1 | 133·6d,g | 6·0 | <0·001 |
| All | 133·0a,b,c | 6·0 | 133·1d,e,f | 5·8 | 134·1a,d | 6·1 | 134·1b,e | 6·1 | 134·4c,f | 6·1 | <0·001 |
| BMI (kg/m2) | |||||||||||
| Boys | 18·0 | 3·1 | 18·2 | 2·9 | 17·9 | 2·9 | 17·9 | 3·0 | 17·8 | 2·8 | 0·002 |
| Girls | 17·9a | 3·1 | 18·0b,c | 2·9 | 17·6 | 2·9 | 17·6b | 2·8 | 17·5a,c | 2·8 | <0·001 |
| All | 18·0A | 3·1 | 18·1B,C | 2·9 | 17·8 | 2·9 | 17·7B | 2·9 | 17·6A,C | 2·8 | <0·001 |
A,B,COnly the mean values with the same superscript letters, in the same row, were significantly different (P<0·05; Games-Howell’s test, with correction of Welch for heteroscedasticity (Levene’s test) on four time points).
a,b,c,d,e,f,gOnly the mean values with the same superscript letters, in the same row, were significantly different (P<0·05; Bonferroni’s post hoc test).
†
Linear regression model with F test on four time points.