| Tertile 1 (low) (n = 286) | Tertile 2 (n = 289) | Tertile 3 (high) (n = 292) | P for trendb |
---|---|---|---|---|
Mean (kg/kg) | 0.45 | 0.54 | 0.64 | – |
 Age, years | 18.6 (18.5, 18.7) | 18.6 (18.5, 18.7) | 18.7 (18.6, 18.8) | 0.278 |
 BMI, Kg/m2 | 21.6 (21.3, 21.9) | 20.0 (19.7, 20.2) | 19.0 (18.8, 19.2) | < 0.001 |
Smoking status, % | ||||
 Occasionally | 5.6 (2.9, 8.3) | 5.2 (2.6, 7.8) | 3.4 (1.3, 5.5) | 0.425 |
 Regularly | 0.3 (−0.3, 1.0) | 0.3 (−0.3, 1.0) | 0.3 (−0.3, 1.0) | 1.000 |
Drinking status, % | ||||
 Occasionally | 55.9 (50.2, 61.7) | 46.4 (40.6, 52.2) | 48.6 (42.9, 54.4) | 0.056 |
 Regularly | 0.0 (0.0, 0.0) | 1.7 (0.2, 3.2) | 1.4 (0.0, 2.7) | 0.097 |
Tertile of physical activity, % | ||||
 Middle (range 28.43–58.50 MET·h·week-1) | 32.2 (26.7, 37.6) | 34.3 (28.8, 39.8) | 33.6 (28.1, 39.0) | 0.864 |
 High (range>58.50 MET·h·week-1) | 36.0 (30.4, 41.6) | 31.1 (25.8, 36.5) | 33.2 (27.8, 38.7) | 0.463 |
Sleep duration (6–8 h), % | 88.0 (84.0, 92.0) | 91.0 (88.0, 94.0) | 90.0 (87.0, 94.0) | 0.480 |
Sleep quality (good), % | 75.2 (70.1, 80.2) | 74.7 (69.7, 79.8) | 77.1 (72.2, 81.9) | 0.788 |
Race, % | ||||
 Han nationality | 86.0 (82.0, 90.1) | 87.2 (83.3, 91.1) | 89.4 (85.8, 92.9) | 0.461 |
 Tujia nationality | 9.4 (6.0, 12.9) | 7.3 (4.3, 10.3) | 6.5 (3.7, 9.4) | 0.393 |
 Miao nationality | 2.8 (0.9, 4.7) | 3.5 (1.3, 5.6) | 1.7 (0.2, 3.2) | 0.417 |
Father education level, % | ||||
 senior high school or below | 93.4 (90.5, 96.3) | 92.0 (88.9, 95.2) | 92.8 (89.8, 95.8) | 0.831 |
 college | 6.3 (3.5, 9.1) | 8.0 (4.8, 11.1) | 6.9 (3.9, 9.8) | 0.730 |
Mother education level, % | ||||
 Senior high school or below | 95.5 (93.0, 97.9) | 95.2 (92.7, 97.7) | 96.6 (94.5, 98.7) | 0.672 |
 College | 4.6 (2.1, 7.0) | 4.8 (2.4, 7.3) | 3.4 (1.3, 5.5) | 0.672 |
Parent’s marital status, % | ||||
 Widowed | 3.9 (1.6, 6.1) | 4.8 (2.4, 7.3) | 2.4 (0.6, 4.2) | 0.291 |
 Divorced | 14.7 (10.6, 18.8) | 13.5 (9.5, 17.5) | 10.3 (6.8, 13.8) | 0.259 |
Only one child, % | 27.6 (22.4, 32.8) | 26.6 (21.5, 31.8) | 21.6 (16.8, 26.3) | 0.199 |
SDS scores | 40.2 (39.3, 41.1) | 39.6 (38.7, 40.4) | 38.6 (37.8, 39.5) | 0.014 |