General characteristics of the study subject by current smoker
| Characteristic | One-person (n=888) | Multi-person (n=7,096) | Total (n=7,984) | P-value |
|---|---|---|---|---|
| Age (y) | 44.30±0.74 | 42.19±0.19 | 43.24±0.40 | 0.004 |
| Sex | 0.003 |
|||
| Male | 676 (82.6) | 6,054 (86.7) | 6,730 (86.3) | |
| Female | 212 (17.4) | 1,042 (13.3) | 1,254 (13.7) | |
| Body weight (kg) | 69.10±0.58 | 70.12±0.19 | 69.61±0.30 | 0.101 |
| Age of starting smoking (y) | 20.62±0.22 | 19.58±0.06 | 20.10±0.12 | <0.001 |
| Smoking period (y) | 23.65±0.66 | 22.58±0.18 | 23.12±0.35 | 0.102 |
| Amount of smoking (cigarette) | 14.68±0.34 | 14.07±0.11 | 14.38±0.18 | 0.087 |
| Heavy smoking | 72 (9.4) | 513 (7.2) | 585 (7.3) | 0.065 |
Values are presented as mean±standard error or number (%).
aCalculated by ANOVA.
bCalculated by chi-square test.