Observed number of exposed cases and controls and OR with 95% CI for breast cancer in Danish women by proxies for occupational UVR exposure
| Cases | Controls | OR* | 95% CI | |
| Overall | 7825 | 38 933 | 0.99 | 0.97 to 1.02 |
| Duration of exposure (years) | ||||
| 1–9 | 6109 | 29 860 | 1.01 | 0.98 to 1.04 |
| 10–20 | 1113 | 5603 | 0.98 | 0.92 to 1.05 |
| >20 | 603 | 3470 | 0.85 | 0.78 to 0.93 |
| Trend test (p value) | 0.10 | |||
| Cumulative exposure† | ||||
| >0%–25% | 1956 | 9712 | 0.99 | 0.95 to 1.05 |
| >25%–50% | 2040 | 9720 | 1.04 | 0.99 to 1.09 |
| >50%–75% | 1975 | 9766 | 1.00 | 0.95 to 1.05 |
| >75% | 1854 | 9735 | 0.94 | (0.89 to 1.00) |
| Trend test (p value) | 0.40 | |||
| Timing of first exposure‡ | ||||
| Prior to first live birth | 4299 | 20 872 | 1.02 | 0.98 to 1.05 |
| After first live birth | 2627 | 13 783 | 0.98 | 0.93 to 1.02 |
| Exposure in last held job§ | ||||
| No | 5971 | 29 820 | 0.99 | 0.96 to 1.02 |
| Yes | 1854 | 9113 | 1.01 | 0.96 to 1.06 |
*Adjusted for parity, age at first live birth and work-related physical activity.
†Exposure level*years summed over employment history and categorised according to percentiles among the controls.
‡Among parous women.
§Among women with lifetime occupational UVR exposure.
UVR, ultraviolet B radiation.