Table 5

Observed number of exposed cases (obs) and OR with 95% CI for subtypes of breast cancer, that is, by ER status, before and after the age of 50 years in Danish women by proxies for occupational UVR exposure

<50 years≥50 years
ER−ER+ER−ER+
ObsOR*95% CIObsOR*95% CIObsOR*95% CIObsOR*95% CI
Ever7461.020.93 to 1.1121121.060.99 to 1.116410.970.88 to 1.0633500.980.94 to 1.02
Duration of exposure (years)
 1–95961.000.90 to 1.1016881.050.99 to 1.114941.000.90 to 1.1125431.010.97 to 1.06
10–201141.140.93 to 1.413111.110.98 to 1.26870.970.77 to 1.234720.910.82 to 1.00
>20361.110.77 to 1.601130.990.80 to 1.21600.750.57 to 0.983350.850.75 to 0.95
Trend test (p value)0.310.040.170.02
Cumulative exposure†
 >0%–25%1590.870.73 to 1.045021.000.90 to 1.101661.000.83 to 1.178721.020.94 to 1.10
 >25%–50%1871.030.87 to 1.215311.080.98 to 1.191781.070.88 to 1.248791.030.95 to 1.11
 >50%–75%2001.100.93 to 1.285441.080.98 to 1.191540.920.74 to 1.078410.980.91 to 1.06
 >75%2001.090.93 to 1.285351.070.97 to 1.181430.860.69 to 1.007580.890.82 to 0.96
Trend test (p value)0.170.010.240.05
  • *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.

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