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Table 1 Demographic and smoking characteristics in overall participants, nonsmokers, and cigarette smokers
| Variables | Overall | nonsmokers | smokers | p* |
|---|---|---|---|---|
| (n = 26,282) | (n = 19,632) | (n = 6650) | ||
| Age (yrs), M ± SD | 38.1 ± 16.06 | 36.6 ± 16.26 | 42.2 ± 14.57 | < 0.001* |
| Range (yrs) | 12–99 | 12–99 | 12–93 | |
| 12–17, % | 10.2% | 13.2% | 1.7% | – |
| 18–29, % | 23.3% | 24.5% | 19.2% | – |
| 30–39, % | 17.2% | 17.3% | 17.0% | – |
| 40–49, % | 28.8% | 26.3% | 36.0% | – |
| 50–59, % | 9.6% | 8.3% | 13.1% | – |
| ≥60, % | 11.0% | 10.3% | 13.0% | – |
| Education (yrs), M ± SD | 10.6 ± 3.79 | 10.7 ± 3.81 | 10.4 ± 3.70 | < 0.001* |
| Illiteracy or Primary school% | 19.0% | 18.6% | 20.2% | – |
| Middle school% | 32.5% | 32.4% | 32.8% | – |
| High school% | 23.3% | 22.9% | 24.8% | – |
| University% | 25.2% | 26.1% | 22.3% | – |
| BMIˣ, M ± SD | 21.2 ± 2.91 | 21.0 ± 2.92 | 21.9 ± 2.76 | < 0.001 |
| Personal income (CNY) | 2228 ± 3388.98 | 2015.5 ± 3227.15 | 2818.0 ± 3738.50 | < 0.001 |
| Employed % | 78.1% | 73.3% | 92.4% | < 0.001 |
| Female % | 46.8% | 60.9% | 5.5% | < 0.001 |
| Married % | 67.9% | 64.8% | 77.0% | < 0.001 |
| First marriage% | 67.3% | 64.3% | 76.1% | – |
| Re-married % | 0.6% | 0.5% | 0.9% | – |
| Unmarried % | 32.1% | 35.2% | 23.0% | < 0.001 |
| Never married% | 26.4% | 29.9% | 16.1% | – |
| Divorced % | 1.9% | 1.7% | 2.6% | – |
| Widowed % | 3.2% | 3.1% | 3.5% | – |
| Separated % | 0.5% | 0.4% | 0.8% | – |
| Rural region% | 31.2% | 30.6% | 33.1% | < 0.001 |
| Urban region % | 68.8% | 69.4% | 66.9% | < 0.001 |
| Provincial capital city% | 22.8% | 23.5% | 21.1% | – |
| Prefecture-level city% | 16.4% | 16.5% | 15.9% | – |
| County-level city% | 16.9% | 16.7% | 17.6% | – |
| Small town% | 12.5% | 12.6% | 12.4% | – |
| Smoking years | – | – | 16.7 ± 12.17 | – |
| Smoked cigarettes/day | – | – | 18.4 ± 14.84 | – |
| Quit attempts response (yes)% | – | – | 28.3% | – |
| Attempts | – | – | 2.9 ± 6.32 | – |
| Smoking craving◊ | – | – | 4.9 ± 2.42 | – |
| Alcohol drinker% | 20% | 8.2% | 54.8% | < 0.001 |
| Drinking years | 15.5 ± 12.58 | 13.6 ± 12.48 | 16.3 ± 12.53 | < 0.001 |
| Alcoholic drinks per week | 4.4 ± 4.31 | 4.0 ± 4.01 | 4.5 ± 4.43 | < 0.001 |
