Table 1.
Body composition variables, weight status and parental socio-economic status in the study cohorts, by familial response behavior
| Birth cohort | ||||||
|---|---|---|---|---|---|---|
| 1999-2000 (n = 1158) | 2007-2008 (n = 1588) | |||||
| Respondents SES | Non-respondents SES | Total | Respondents SES | Non-respondents SES | Total | |
| Boys, n (%) | 253 (46.5) | 334 (54.2) | 587 (50.7) | 715 (51.1) | 91 (47.9) | 806 (50.8) |
| Girls, n (%) | 291 (53.5) | 280 (45.5) | 571 (49.3) | 571 (48.9) | 99 (52.1) | 782 (49.2) |
| Age mean, years (range) | 9.4 (8–11) | 9.7 (8–11) | 9.5 (8–11) | 5.3 (4–7) | 5.4 (4–7) | 5.3 (4–7) |
| Body composition variables, mean (SD) | ||||||
| Weight (kg) | 37.3 (9.3) | 37.4 (9.1) | 37.3 (9.2) | 21.3 (4.7) | 21.7 (5.0) | 21.4 (4.8) |
| Height (cm) | 139.6 (7.2) | 139.5 (6.8) | 139.6 (7.0) | 115.4 (6.1) | 115.7 (5.8) | 115.5 (6.1) |
| BMI (kg/m2) | 19.0 (3.7) | 19.0 (3.7) | 19.0 (3.7) | 15.9 (2.4) | 16.0 (2.6) | 15.9 (2.5) |
| BF% | 25.4 (6.6) | 25.2 (6.9) | 25.3 (6.8) | 20.1 (5.8) | 20.5 (6.2) | 20.2 (5.8) |
| Weight status categories, % (95 % CI) | ||||||
| Underweight | 7.5 (5.2-9.8) | 8.6 (6.3-10.9) | 8.1 (6.5-9.7) | 20.5 (18.4-22.7) | 20.5 (14.5-26.5) | 20.5 (18.5-22.5) |
| Normal weight | 57.4 (53.1-61.6) | 55.4 (51.5-59.5) | 56.4 (53.5-59.3) | 59.2 (56.5-61.8) | 57.9 (50.6-65.2) | 59.0 (56.5-61.4) |
| Overweight | 25.9 (22.1-29.7) | 25.0 (21.6-28.6) | 25.5 (22.9-28.0) | 12.0 (10.3-13.7) | 10.5 (5.9-15.1) | 11.8 (10.2-13.4) |
| Obesity | 9.2 (6.7-11.7) | 10.7 (8.2-13.3) | 10.0 (8.2-11.8) | 8.3 (6.8-9.8) | 11.1 (6.3-15.8) | 8.6 (7.2-10.0) |
| Overweight/obesity | 35.1 (31.0-39.2) | 35.7 (31.9-39.7) | 35.5 (32.7-38.3) | 20.3 (18.2-22.5) | 21.6 (15.5-27.7) | 20.4 (18.4-22.5) |
| Parental socio-economic status, % (95 % CI) | ||||||
| N = 544 | N = 1398 | |||||
| Lower | 1.6 (0.5-2.9) | 3.5 (2.5-4.5) | ||||
| Lower middle | 18.9 (15.5-22.3) | 27.3 (24.9-29.7) | ||||
| Middle | 38.2 (34.1-42.4) | 44.8 (42.2-47.5) | ||||
| Upper middle | 31.8 (27.8-35.8) | 19.9 (17.8-22.1) | ||||
| Upper | 9.4 (6.8-11.9) | 4.4 (3.2-5.5) | ||||
Abbreviations: BMI body mass index, BF% body fat percentage, SD Standard deviation, CI confidence interval