Table 2. Descriptive statistics of samples of children at the three follow-ups.
|
Boys |
Girls |
|||||
|---|---|---|---|---|---|---|
| 7 years | 12 years | 15 years | 7 years | 12 years | 15 years | |
| N (%) | 270 (50.8) | 209 (48.3) | 142 (47.7) | 261 (49.2) | 224 (51.7) | 156 (52.3) |
| Age (years) (mean (s.d.)) | 7.4 (0.5) | 12.5 (0.3) | 15.2 (0.4) | 7.5 (0.4) | 12.5 (0.3) | 15.2 (0.4) |
| Pubertal maturationa(n(%)) | ||||||
| Early | 42 (30.2) | 36 (23.2) | ||||
| Mid | 56 (40.3) | 61 (39.4) | ||||
| Late | 41 (29.5) | 58 (37.4) | ||||
| BMI (mean (s.d.)) | 16.7 (2.4) | 20.1 (3.8) | 21.1 (4.2) | 16.9 (2.4) | 21.1 (4.0) | 23.2 (4.7) |
| BMI SDSb (mean (s.d.)) | 0.4 (1.2) | 0.7 (1.3) | 0.4 (1.3) | 0.4 (1.0) | 0.7 (1.1) | 0.8 (1.2) |
| Weight statusb (n(%)) | ||||||
| Underweight | 5 (1.9) | 6 (2.9) | 9 (6.3) | 3 (1.1) | 0 (0.0) | 1 (0.6) |
| Normal | 207 (76.7) | 138 (66.0) | 99 (69.7) | 211 (80.8) | 157 (70.1) | 110 (70.5) |
| Overweight | 33 (12.2) | 37 (17.7) | 15 (10.6) | 31 (11.9) | 42 (18.8) | 26 (16.7) |
| Obese | 25 (9.3) | 28 (13.4) | 19 (13.4) | 16 (6.1) | 25 (11.2) | 19 (12.2) |
Abbreviations: BMI, body mass index; N, number; SDS, standard deviation score.
Percentages do not add to 100 in all cases due to rounding.
a
Missing for three boys and one girl.
b
According to UK 1990 BMI reference curves for children.2