Table 1.
Description of the study sample.
| Boys | Girls | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Total (N = 13,220) | 1958 NCDS (N = 6727) | 2001 MCS (N = 6493) | Total (N = 12,711) | 1958 NCDS (N = 6336) | 2001 MCS (N = 6375) | ||||
| % missing | % missing | ||||||||
| Cohort | 0 | 0 | |||||||
| 1958 NCDS | N (%) | 6727 (50.9) | 6336 (49.9) | ||||||
| 2001 MCS | N (%) | 6493 (49.1) | 6375 (50.1) | ||||||
| Ethnicity | 1.2 | 0.7 | |||||||
| White British | N (%) | 11849 (90.7) | 6435 (98.0) | 5414 (83.4) | 11422 (90.5) | 6129 (98.1) | 5293 (83.0) | ||
| Other | N (%) | 1209 (9.3) | 130 (2.0) | 1079 (16.6) | 1200 (9.5) | 118 (1.9) | 1082 (17.0) | ||
| Mother | |||||||||
| Age (years) | Mean (SD) | 28.2 (5.8) | 5.7 | 27.5 (5.7) | 28.9 (5.8) | 28.2 (5.8) | 5.0 | 27.5 (5.6) | 28.9 (5.8) |
| Height (cm) | Mean (SD) | 162.3 (6.8) | 5.3 | 161.1 (6.4) | 163.5 (6.9) | 162.4 (6.8) | 4.8 | 161.1 (6.4) | 163.7 (7.0) |
| BMI (kg/m2) | Median (IQR) | 24.0 (21.8, 27.3) | 17.3 | 23.6 (21.5, 26.3) | 24.8 (22.3, 28.5) | 24.0 (21.8, 27.1) | 16.8 | 23.4 (21.5, 26.0) | 24.9 (22.3, 28.5) |
| Underweight | N (%) | 285 (2.6) | 203 (3.4) | 82 (1.7) | 293 (2.8) | 204 (3.5) | 89 (1.9) | ||
| Normal weight | N (%) | 6195 (56.7) | 3726 (61.4) | 2469 (50.8) | 6056 (57.3) | 3652 (63.4) | 2404 (49.9) | ||
| Overweight | N (%) | 3022 (27.7) | 1618 (26.7) | 1404 (28.9) | 2882 (27.3) | 1439 (25.0) | 1443 (30.0) | ||
| Obese | N (%) | 1426 (13.1) | 520 (8.6) | 906 (18.6) | 1346 (12.7) | 465 (8.1) | 881 (18.3) | ||
| Father | |||||||||
| Age (years) | Mean (SD) | 31.3 (6.3) | 17.8 | 30.5 (6.4) | 32.2 (6.0) | 31.4 (6.2) | 17.8 | 30.6 (6.3) | 32.4 (6.0) |
| Height (cm) | Mean (SD) | 175.7 (7.6) | 29.2 | 174.5 (7.4) | 177.8 (7.3) | 175.8 (7.6) | 29.1 | 174.5 (7.5) | 177.9 (7.4) |
| BMI (kg/m2) | Median (IQR) | 25.1 (23.1, 27.6) | 31.8 | 24.5 (22.6, 26.6) | 26.8 (24.5, 29.7) | 25.2 (23.1, 27.7) | 31.7 | 24.5 (22.6, 26.6) | 26.8 (24.5, 29.4) |
| Underweight | N (%) | 65 (0.7) | 54 (0.9) | 11 (0.4) | 67 (0.8) | 51 (0.9) | 16 (0.5) | ||
| Normal weight | N (%) | 4299 (47.7) | 3354 (56.8) | 945 (30.4) | 4107 (47.3) | 3187 (57.2) | 920 (29.5) | ||
| Overweight | N (%) | 3625 (40.2) | 2170 (36.8) | 1455 (46.8) | 3553 (40.9) | 2032 (36.5) | 1521 (48.8) | ||
| Obese | N (%) | 1025 (11.4) | 325 (5.5) | 700 (22.5) | 955 (11.0) | 298 (5.4) | 657 (21.1) | ||
| Tenure | 6.8 | 5.8 | |||||||
| Own (outright or mortgage) | N (%) | 5735 (46.6) | 3511 (56.9) | 2224 (36.2) | 5601 (46.8) | 3364 (57.2) | 2237 (36.7) | ||
| Other | N (%) | 6581 (53.4) | 2655 (43.1) | 3926 (63.8) | 6370 (53.2) | 2517 (42.8) | 3853 (63.3) | ||
| ccupational class | 16.0 | 16.1 | |||||||
| I (Professional) | N (%) | 544 (4.9) | 284 (4.7) | 260 (5.2) | 537 (5.0) | 263 (4.6) | 274 (5.6) | ||
| II (Managerial and technical) | N (%) | 3326 (30.0) | 1193 (19.6) | 2133 (42.4) | 3225 (30.1) | 1153 (20.1) | 2072 (42.0) | ||
| IIIN (Skilled non-manual) | N (%) | 1329 (12.0) | 639 (10.5) | 690 (13.7) | 1265 (11.9) | 628 (11.0) | 637 (12.9) | ||
| IIIM (Skilled manual) | N (%) | 3702 (33.3) | 2563 (42.2) | 1139 (22.6) | 3410 (32.0) | 2318 (40.5) | 1092 (22.2) | ||
| IV (Partly-skilled) | N (%) | 1558 (14.0) | 888 (14.6) | 670 (13.3) | 1582 (14.8) | 879 (15.3) | 703 (14.3) | ||
| V (Unskilled) | N (%) | 645 (5.8) | 506 (8.3) | 139 (2.8) | 640 (6.0) | 488 (8.5) | 152 (3.1) | ||
| Maternal age left full-time education | 16.8 | 15.2 | |||||||
| ≥23 | N (%) | 407 (3.7) | 26 (0.5) | 381 (6.2) | 418 (3.9) | 16 (0.3) | 402 (6.6) | ||
| 21–22 | N (%) | 787 (7.2) | 63 (1.3) | 724 (11.8) | 827 (7.7) | 97 (2.1) | 730 (12.0) | ||
| 19–20 | N (%) | 536 (4.9) | 63 (1.3) | 473 (7.7) | 525 (4.9) | 69 (1.5) | 456 (7.5) | ||
| 18 | N (%) | 1090 (9.9) | 112 (2.3) | 978 (15.9) | 1120 (10.4) | 113 (2.4) | 1007 (16.6) | ||
| 17 | N (%) | 1075 (9.8) | 213 (4.4) | 862 (14.1) | 1017 (9.4) | 217 (4.6) | 800 (13.2) | ||
| 16 | N (%) | 2769 (25.2) | 590 (12.1) | 2179 (35.5) | 2706 (25.1) | 556 (11.9) | 2150 (35.3) | ||
| 15 | N (%) | 1892 (17.2) | 1462 (30.0) | 430 (7.0) | 1858 (17.2) | 1421 (30.3) | 437 (7.2) | ||
| 14 | N (%) | 2312 (21.0) | 2258 (46.4) | 54 (0.9) | 2177 (20.2) | 2126 (45.3) | 51 (0.8) | ||
| ≤13 | N (%) | 137 (1.2) | 83 (1.7) | 54 (0.9) | 129 (1.2) | 78 (1.7) | 51 (0.8) | ||