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Table 3 Percentage of sleep disturbances (poor sleepers) in different age stages, levels of education, marital status and regions among overall participants, nonsmokers, and cigarette smokers
| Variables | insomnia (PSQI > 5), % | |||
|---|---|---|---|---|
| Overall | nonsmokers | smokers | p* | |
| Age (yrs) | ||||
| 12–17, % | 15.4% | 14.6% | 33.3% | < 0.001 |
| 18–29, % | 24.7% | 23.3% | 30.0% | < 0.001 |
| 30–39, % | 23.6% | 21.4% | 30.3% | < 0.001 |
| 40–49, % | 25.0% | 23.5% | 28.2% | < 0.001 |
| 50–59, % | 31.8% | 30.0% | 35.1% | 0.011 |
| ≥60, % | 45.2% | 43.4% | 49.5% | 0.003 |
| Education (yrs) | ||||
| Illiteracy or Primary school% | 32.6% | 31.4% | 35.9% | 0.003 |
| Middle school% | 22.4% | 20.3% | 28.6% | < 0.001 |
| High school% | 27.0% | 24.4% | 34.3% | 0.011 |
| University% | 26.6% | 24.6% | 33.5% | 0.003 |
| Marital status | ||||
| Married % | 26.0% | 25.0% | 31.2% | < 0.001 |
| First marriage% | 26.7% | 25.0% | 31.0% | – |
| Re-married % | 39.6% | 35.5% | 46.4% | – |
| Unmarried % | 26.6% | 24.1% | 37.7% | < 0.001 |
| Never married% | 22.0% | 20.1% | 32.5% | – |
| Divorced % | 38.5% | 39.6% | 41.9% | – |
| Widowed % | 54.2% | 53.0% | 57.5% | – |
| Separated % | 35.8% | 32.9% | 42.0% | – |
| Regions | ||||
| Rural region% | 29.4% | 27.3% | 34.6% | < 0.001 |
| Urban region % | 25.5% | 23.5% | 31.6% | < 0.001 |
| Provincial capital city% | 27.0% | 25.1% | 33.5% | – |
| Prefecture-level city% | 23.5% | 21.3% | 30.0% | – |
| County-level city% | 25.9% | 23.9% | 31.3% | – |
| Small town% | 24.8% | 22.9% | 30.7% | – |
