Table 3.
Stratified Analyses by Age and Occupation/Social Position for Associations Between Cumulative Exposure to LWH and Occurrence of IHD (Odds Ratio and 95% CIs)a
| LWH | Cases: n (%) | IHD (Including Angina Pectoris) | IHD (Excluding Angina Pectoris) | |
|---|---|---|---|---|
| Age | ||||
| <50 y | No | 113 (0.20) | 1.00 | 1.00 |
| Yes (<10 y) | 21 (0.19) | 1.02 (0.59–1.76) | 0.92 (0.47–1.81) | |
| Yes (≥10 y) | 15 (0.32) | 1.12 (0.59–2.15) | 1.35 (0.66–2.77) | |
| ≥50 y | No | 1186 (2.34) | 1.00 | 1.00 |
| Yes (<10 y) | 126 (2.83) | 0.97 (0.77–1.22) | 0.93 (0.69–1.26) | |
| Yes (≥10 y) | 414 (4.22) | 1.23 (1.07–1.42) | 1.29 (1.08–1.54) | |
| Occupation/social position | ||||
| Manager, CEO, skilled jobs | No | 348 (1.09) | 1.00 | 1.00 |
| Yes (<10 y) | 37 (0.57) | 0.93 (0.63–1.35) | 0.75 (0.45–1.24) | |
| Yes (≥10 y) | 197 (2.76) | 1.20 (0.98–1.46) | 1.23 (0.96–1.58) | |
| High‐skilled white collar workers | No | 376 (1.21) | 1.00 | 1.00 |
| Yes (<10 y) | 48 (1.28) | 1.28 (0.90–1.81) | 1.34 (0.87–2.05) | |
| Yes (≥10 y) | 93 (2.80) | 1.17 (0.89–1.54) | 1.19 (0.85–1.67) | |
| Low‐skilled white collar workers | No | 185 (0.72) | 1.00 | 1.00 |
| Yes (<10 y) | 23 (0.79) | 1.23 (0.74–2.05) | 1.31 (0.70–2.48) | |
| Yes (≥10 y) | 31 (2.01) | 1.24 (0.79–1.94) | 1.60 (0.95–2.70) | |
| Blue collar workers | No | 259 (2.34) | 1.00 | 1.00 |
| Yes (<10 y) | 18 (1.27) | 0.64 (0.37–1.12) | 0.52 (0.25–1.10) | |
| Yes (≥10 y) | 67 (5.42) | 1.50 (1.07–2.12) | 1.50 (0.99–2.27) | |
CEO indicates chief executive officer; ICH, ischemic heart disease; and LWH, long working hours.
a
Adjusted for body mass index, smoking habits, high blood pressure, diabetes mellitus, dyslipidemia, and familial history of cardiovascular diseases (plus sex and occupation/social position for age stratification, and sex and age for occupation/social position stratification).