Table 1.
Participant characteristics by sex1
| Variables2 | Boys | Girls | Total | X2 |
|---|---|---|---|---|
| Total | 36,655 (52.3) | 35,780 (47.7) | 72,435 (100.0) | |
| Age (yr) | ||||
| 12-14 | 16,128 (41.6) | 14,992 (41.8) | 31,120 (41.7) | 0.006 |
| 15-18 | 20,286 (58.4) | 20,641 (58.2) | 40,927 (58.3) | |
| Subjective economic status*** | ||||
| High | 3,452 (9.7) | 1,770 (5.1) | 5,222 (7.5) | 86.11 |
| Middle-high | 9,312 (25.9) | 8,213 (23.7) | 17,525 (24.9) | |
| Middle | 16,377 (44.7) | 18,117 (50.4) | 34,494 (47.4) | |
| Low-middle | 5,708 (15.1) | 6,098 (16.5) | 11,806 (15.8) | |
| Low | 1,806 (4.7) | 1,582 (4.2) | 3,388 (4.5) | |
| Current smoking*** | ||||
| Yes | 5,349 (14.4) | 1,745 (4.6) | 7,094 (9.7) | 831.20 |
| No | 31,306 (85.6) | 34,035 (95.4) | 65,341 (90.3) | |
| Current drinking*** | ||||
| Yes | 7,139 (19.4) | 4,827 (12.8) | 11,966 (16.3) | 189.83 |
| No | 29,516 (80.6) | 30,953 (87.2) | 60,469 (83.7) | |
| Eating breakfast (times/wk) | ||||
| <3 | 9,847 (26.7) | 9,470 (26.2) | 19,317 (26.4) | 1.2 |
| ≥3 | 26,808 (73.3) | 26,310 (73.8) | 53,118 (73.6) | |
| Eating fruit daily*** | ||||
| Yes | 6,650 (18.8) | 7,100 (20.8) | 13,750 (19.7) | 24.09 |
| No | 30,005 (81.2) | 28,680 (79.2) | 58,685 (80.3) | |
| Vegetable consumption (serving/d)*** | ||||
| <3 | 30,030 (82.3) | 30,218 (84.6) | 60,248 (83.4) | 50.86 |
| ≥3 | 6,625 (17.7) | 5,562 (15.4) | 12,187 (16.6) | |
| Participation in 60 min of physical activity (times/wk)*** | ||||
| <3 | 21,424 (58.8) | 27,715 (77.8) | 49,139 (67.9) | 1,321.97 |
| ≥3 | 15,231 (41.2) | 8,065 (22.2) | 23,296 (32.1) | |
| Sedentary behavior (hr/d)*** | ||||
| <2 | 12,705 (36.1) | 10,512 (30.9) | 23,217 (33.7) | 106.19 |
| ≥2 | 22,313 (63.9) | 23,737 (69.1) | 46,050 (66.3) | |
| Hours of sleep (weekdays, hr/night)*** | ||||
| <8 | 22,604 (73.5) | 26,054 (83.2) | 48,658 (78.2) | 90.27 |
| ≥8 | 9,012 (26.5) | 5,637 (16.8) | 14,649 (21.8) | |
| Hours of sleep (weekends, hr/night)** | ||||
| <8 | 10,788 (34.9) | 9,895 (32.4) | 20,683 (33.7) | 8.55 |
| ≥8 | 21,032 (65.1) | 21,420 (67.6) | 42,452 (66.3) | |
| Happiness level*** | ||||
| Very unhappy | 644 (1.7) | 626 (1.7) | 1,270 (1.7) | 169.96 |
| A little unhappy | 3,028 (8.4) | 4,067 (11.4) | 7,095 (9.8) | |
| Neutral | 10,091 (27.7) | 11,852 (33.0) | 21,943 (30.2) | |
| A little happy | 13,563 (37.2) | 13,154 (37.1) | 2,617 (37.1) | |
| Very happy | 9,329 (25.0) | 6,081 (16.9) | 15,410 (21.1) |
Values are presented as number (%).
1
Weighted percentage using survey sample weights.
2
p-values were determined using the chi-square test.
**
p<0.01,
***
p<0.001.