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% | – |