| Age(years) | Women | Men | |
| Blue-collar workers | Housewives | Blue-collar workers | |
| 25–29 | 5.2 (3.7 to 7.3) | 5.1 (3.3 to 7.7) | 5.9 (2.5 to 13.5) |
| 30–34 | 4.9 (3.8 to 6.3) | 4.6 (3.4 to 6.0) | 3.5 (2.2 to 5.8) |
| 35–39 | 4.4 (3.6 to 5.4) | 4.5 (3.6 to 5.5) | 7.1 (4.4 to 11.6) |
| 40–44 | 3.5 (3.0 to 4.2) | 3.6 (3.0 to 4.3) | 6.0 (4.0 to 9.2) |
| 45–49 | 5.0 (4.3 to 5.9) | 4.6 (3.9 to 5.4) | 4.7 (3.4 to 6.5) |
| 50–54 | 4.0 (3.4 to 4.7) | 3.4 (3.0 to 4.0) | 3.6 (2.6 to 5.0) |
| 55–59 | 3.6 (2.9 to 4.6) | 2.9 (2.3 to 3.6) | 5.1 (3.4 to 7.6) |
All statistical comparisons with white-collar counterparts (reference categories) were highly significant (p<0.001, z test).