Table 1.
Descriptive characteristics of the population included in this study.
| Variables | Total (n = 48537) | Boys (n = 24235) | Girls (n = 24302) | p-value |
|---|---|---|---|---|
| Area of residence, % | ||||
| urban | 24464(50.4) | 12193(50.3) | 12271(50.5) | 0.722 # |
| rural | 24057(49.6) | 12029(49.7) | 12028(49.5) | |
| Age, years | ||||
| 9 | 13381(27.6) | 6632(27.4) | 6749(27.8) | 0.617 # |
| 12 | 17531(36.1) | 8782(36.3) | 8749(36.0) | |
| 14 | 17609(36.3) | 8808(36.4) | 8801(36.2) | |
| Nutritional status | ||||
| Normal weight | 35250(72.6) | 16016(66.1) | 19234(79.2) | <0.001 * |
| Thinness | 1891(3.9) | 945(3.9) | 946(3.9) | |
| Overweight | 7780(16.0) | 4504(18.6) | 3276(13.5) | |
| Obesity | 3600(7.4) | 2757(11.4) | 843(3.5) | |
| Sleeping duration | ||||
| Not enough | 34957(72.0) | 17041(70.4) | 17916(73.7) | <0.001 # |
| Enough | 13564(28.0) | 7181(29.6) | 6383(26.3) | |
| Eating eggs every day | ||||
| Yes | 7212(14.9) | 3842(15.9) | 3370(13.9) | <0.001 # |
| No | 41309(85.1) | 20380(84.1) | 20929(86.1) | |
| Having milk every day | ||||
| Yes | 18450(38.0) | 9634(39.8) | 8816(36.3) | <0.001 # |
| No | 30071(62.0) | 14588(60.2) | 15483(63.7) | |
| Having breakfast every day | ||||
| Yes | 37293(76.9) | 18553(76.6) | 18740(77.1) | 0.166 # |
| No | 11227(23.1) | 5677(23.4) | 5562 (22.9) | |
| Spermarche/menarche | ||||
| Yes | 20287(53.3) | 6659(44.0) | 13628(59.5) | <0.001 # |
| No | 17749(46.7) | 8481(56.0) | 9268(40.5) | |
Notes: # indicates the statistical test was conducted by Chi-square test, * indicates the statistical test was conducted by one-way ANOVA.