Table 1.
Participants' characteristics.
| Year 2006 | Year 2010 | Year 2014 | |
|---|---|---|---|
| Characteristics |
M or % (95% CI) |
M or % (95% CI) |
M or % (95% CI) |
| n = 168,179 | n = 176,321 | n = 174,871 | |
| Sex | |||
| Boys | 48.1 (47.9, 48.3) | 48.3 (48.1, 48.6) | 48.5 (48.2, 48.7) |
| Girls | 51.9 (51.7, 52.1) | 51.7 (51.4, 51.9) | 51.5 (51.3, 51.8) |
| Age (years) | 13.63 (13.63, 13.64) | 13.61 (13.60, 13.62) | 13.15 (13.15, 13.16) |
| Age interval | |||
| 10–12 years | 32.7 (32.4, 32.9) | 31.5 (31.3, 31.8) | 32.1 (31.8, 32.3) |
| 13–14 years | 34.4 (34.1, 34.6) | 34.9 (34.7, 35.1) | 35.5 (35.3, 35.7) |
| 15–16 years | 33.0 (21.7, 33.2) | 33.5 (33.3, 33.8) | 32.5 (32.3, 32.7) |
| Live with | |||
| Only mother | 19.5 (19.4, 19.8) | 20.1 (19.9, 20.3) | 19.3 (19.1, 19.5) |
| Only father | 2.6 (2.5, 2.6) | 3.0 (2.9, 3.0) | 2.8 (2.7, 2.9) |
| Mother and father | 73.7 (73.5, 73.9) | 74.1 (73.8, 74.3) | 73.4 (73.2, 73.6) |
| Other people | 4.2 (4.1, 4.3) | 2.8 (2.8, 3.0) | 4.5 (4.4, 4.6) |
| Have brothers or sisters | |||
| No | 14.5 (14.3, 14.6) | 16.9 (16.6, 17.0) | 17.5 (17.3, 17.7) |
| 1–2 brothers/sisters | 67.6 (67.3, 67.8) | 66.6 (66.6, 67.1) | 64.7 (64.4, 64.9) |
| ≥3 brothers/sisters | 18.0 (17.8, 18.2) | 16.5 (16.2, 16.6) | 17.8 (17.6, 18.0) |
| FAS | |||
| Low | 9.2 (9.0, 9.3) | 5.4 (5.3, 5.5) | 7.1 (7.0, 7.2) |
| Medium | 43.4 (43.1, 43.6) | 35.1 (34.9, 35.3) | 36.0 (35.8, 36.2) |
| High | 47.4 (47.2, 47.7) | 59.5 (59.3, 59.7) | 56.9 (56.7, 57.2) |
FAS, family affluence scale; M, median; CI, confidence interval.