Table 4

Observed number of exposed cases and controls and OR with 95% CI for subtypes of breast cancer, that is, by ER status, by proxies for occupational UVR exposure

ER−ER+
CasesControlsOR*95% CICasesControlsOR*95% CI
Ever138769351.000.93 to 1.06546226 8581.010.97 to 104
Duration of exposure (years)
 1–9109054371.000.93 to 1.07423120 3841.030.99 to 1.07
10–202019391.060.91 to 1.2478339540.980.91 to 1.06
>20965590.850.68 to 1.0644825200.880.79 to 0.97
Trend test (p value)0.750.46
Cumulative exposure†
 >0%–25%32517260.940.83 to 1.06138067011.020.96 to 1.08
 >25%–50%35817351.030.91 to 1.16142167201.050.99 to 1.11
 >50%–75%35717401.020.91 to 1.15138367201.020.96 to 1.08
 >75%34717340.990.88 to 1.12127867170.940.89 to 1.00
Trend test (p value)0.730.84
Timing of first exposure‡
Prior to first live birth75837971.010.93 to 1.10300614 2201.041.00 to 1.09
After first live birth45723570.970.88 to 1.01186096940.990.94 to 1.04
Exposure in last held job§
No103552510.980.91 to 1.06420820 6611.010.97 to 1.05
Yes35216841.040.93 to 1.17125461971.010.95 to 1.07
  • *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.

  • ER, oestrogen receptor; UVR, ultraviolet B radiation.