Table 2. Results of a multiple logistic regression analysis comparing job categories n=920.
| Independent variables | OR | 95% CI | P values | |
|---|---|---|---|---|
| Job category | White-collar workers | 1.00 | ||
| Professional drivers | 1.74 | 1.150–2.625 | 0.009 | |
| Age group (years) | 30–49 | 1.00 | ||
| 50–69 | 2.30 | 1.600–3.301 | <0.001 | |
| Annual family income |
≥4 million yen | 1.00 | ||
| <4 million yen | 1.45 | 1.016–2.066 | 0.040 | |
| Working hours | <8 h | 1.00 | ||
| ≥8 h | 0.76 | 0.513–1.137 | 0.185 | |
| Shift work | No | 1.00 | ||
| Yes | 1.34 | 0.925–1.940 | 0.122 | |
| Duration of employment | <10 years | 1.00 | ||
| ≥10 years | 0.78 | 0.538–1.126 | 0.184 | |
| Night work | No | 1.00 | ||
| Yes | 1.04 | 0.683–1.585 | 0.853 |