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+
	Obs	OR*	95% CI	Obs	OR*	95% CI	Obs	OR*	95% CI	Obs	OR*	95% CI
Ever	746	1.02	0.93 to 1.11	2112	1.06	0.99 to 1.11	641	0.97	0.88 to 1.06	3350	0.98	0.94 to 1.02
Duration of exposure (years)
1–9	596	1.00	0.90 to 1.10	1688	1.05	0.99 to 1.11	494	1.00	0.90 to 1.11	2543	1.01	0.97 to 1.06
10–20	114	1.14	0.93 to 1.41	311	1.11	0.98 to 1.26	87	0.97	0.77 to 1.23	472	0.91	0.82 to 1.00
>20	36	1.11	0.77 to 1.60	113	0.99	0.80 to 1.21	60	0.75	0.57 to 0.98	335	0.85	0.75 to 0.95
Trend test (p value)	0.31			0.04			0.17			0.02
Cumulative exposure†
>0%–25%	159	0.87	0.73 to 1.04	502	1.00	0.90 to 1.10	166	1.00	0.83 to 1.17	872	1.02	0.94 to 1.10
>25%–50%	187	1.03	0.87 to 1.21	531	1.08	0.98 to 1.19	178	1.07	0.88 to 1.24	879	1.03	0.95 to 1.11
>50%–75%	200	1.10	0.93 to 1.28	544	1.08	0.98 to 1.19	154	0.92	0.74 to 1.07	841	0.98	0.91 to 1.06
>75%	200	1.09	0.93 to 1.28	535	1.07	0.97 to 1.18	143	0.86	0.69 to 1.00	758	0.89	0.82 to 0.96
Trend test (p value)	0.17			0.01			0.24			0.05

*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.