Table 4. Multiple logistic regression analysis for smoking status (non-smoking).
| Variables | Odds Ratio | 95%CI |
| Body Mass Index | ||
| Under 22 | 1.00 | |
| 22 and over | 1.34 | 1.16 - 1.54 |
| Heart disease | ||
| No | 0.67 | 0.48 - 0.94 |
| Yes | 1.00 | |
| Peptic ulcer | ||
| No | 2.65 | 1.61 - 4.35 |
| Yes | 1.00 | |
| Health check-ups | ||
| No | 1.00 | |
| Yes | 1.16 | 1.01 - 1.32 |
| Bedtime | ||
| Before 12 | 1.75 | 1.51 - 2.03 |
| After 12 | 1.00 | |
| Mental stress | ||
| Aware | 1.00 | |
| Unaware | 1.25 | 1.08 - 1.44 |
| Current habit of exercise | ||
| No | 1.00 | |
| Yes | 1.35 | 1.18 - 1.54 |
| Japanese pickles (Tsukemono) | ||
| Not daily | 1.00 | |
| Daily | 0.77 | 0.67 - 0.88 |
| Fresh vegetables | ||
| Not daily | 1.00 | |
| Daily | 1.29 | 1.11 - 1.50 |
| Yellow and green vegetables | ||
| Not daily | 1.00 | |
| Daily | 1.21 | 1.04 - 1.40 |
| Fruit | ||
| Not daily | 1.00 | |
| Daily | 1.25 | 1.09 - 1.44 |
| Coffee | ||
| Not daily | 1.00 | |
| Daily | 0.48 | 0.42 - 0.56 |
| Green tea | ||
| Not daily | 1.00 | |
| Daily | 0.71 | 0.59 - 0.85 |
| Alcohol - frequency | ||
| Not daily | 1.00 | |
| Daily | 0.82 | 0.70 - 0.97 |
| Alcohol - amount per day | ||
| Under 1 go | 1.00 | |
| 1 go and over | 0.71 | 0.60 - 0.84 |
Odds ratio and 95% CI were based on a step-wise multiple logistic regression analysis after adjusted for sex and age.