| Participants at age 15a (n = 1808) | CMR z-score at age 15 | Participants at age 17a (n = 1629) | CMR z-score at age 17 | Participants at age 24a (n = 1760) | CMR z-score at age 24 | |||
---|---|---|---|---|---|---|---|---|---|
n (%) | Mean (95% CI) | P trend | n (%) | Mean (95% CI) | P trend | n (%) | Mean (95% CI) | P trend | |
Sex | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Male  Female | 970 (53.7) 838 (46.3) | Ref 0.34 (0.25, 0.43) | < 0.001 | 781 (47.9) 848 (52.1) | Ref 0.23 (0.14, 0.32) | < 0.001 | 732 (41.6) 1028 (58.4) | Ref -0.19 (-0.29,-0.10) | < 0.001 |
Social classa | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 I, II, III non-manual  III manual, IV, V | 1089 (60.2) 719 (39.8) | Ref 0.03 (-0.06, 0.13) | 0.460 | 1018 (62.5) 611 (37.5) | Ref 0.13 (0.04, 0.23) | < 0.001 | 1120 (63.6) 640 (36.4) | Ref 0.15 (0.05, 0.24) | < 0.001 |
Maternal educational levelb | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 A-level or degree  O-level  Vocational  CSE or none | 914 (50.5) 603 (33.4) 128 (7.1) 163 (9.0) | Ref 0.12 (0.02, 0.22) 0.01 (-0.18, 0.19) 0.08 (-0.08, 0.25) | 0.135 | 860 (52.8) 518 (31.8) 113 (6.9) 138 (8.5) | Ref 0.17 (0.06, 0.27) 0.11 (-0.07, 0.30) 0.27 (0.09, 0.44) | < 0.001 | 935 (53.1) 583 (33.1) 101 (5.7) 141 (8.0) | Ref 0.25 (0.15, 0.35) 0.30 (0.10, 0.50) 0.21 (0.04, 0.39) | < 0.001 |
Physical activity level age 13c | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Inactive (< 60 MVPA/day)  Active (≥ 60 MVPA/day) | 1191 (65.9) 617 (34.1) | Ref -0.31 (-0.41,-0.22) | < 0.001 | 1077 (66.1) 552 (33.9) | Ref -0.19 (-0.28,-0.09) | < 0.001 | 1218 (69.2) 542 (30.8) | Ref -0.07 (-0.17, 0.03) | 0.198 |
Dietary misreportingd | Â | Â | Â | Â | Â | Â | Â | Â | Â |
 Over-reporting  Plausible reporting  Under-reporting | 19 (1.1) 677 (37.4) 1112 (61.5) | -0.50 (-0.94,-0.05) Ref 0.28 (0.18, 0.37) | < 0.001 | 16 (1.0) 640 (39.4) 973 (59.6) | -0.39 (-0.86, 0.08) Ref 0.30 (0.21, 0.40) | < 0.001 | 13 (0.7) 697 (39.6) 1050 (59.7) | -0.10 (0.65, 0.45) Ref 0.24 (0.15, 0.34) | < 0.001 |