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Characteristics of Study Participants: Demographics
| Total (n = 8805) |
Males (n = 4276) |
Females (n = 4471) |
|
|---|---|---|---|
| Age* (mean, SD) | 13.72 (1.08) | 13.79 (1.09) | 13.65 (1.06) |
| Gender (% female) | 51.1% | n/a | n/a |
| Grade | |||
| 7 | 30.7% | 31.4% | 29.6% |
| 8 | 33.4% | 33.2% | 33.8% |
| 9 | 35.9% | 35.4% | 36.7% |
| City/Site | |||
| Beijing | 26.5% | 26.3% | 26.9% |
| Hangzhou | 20.3% | 20.9% | 19.9% |
| Wuhan | 20.4% | 19.9% | 20.4% |
| Urumchi | 32.7% | 32.9% | 32.8% |
* Gender difference is statistically significant at p < .05; SD = standard deviation
