. Author manuscript; available in PMC: 2015 Nov 1.

Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2014 Aug 7;23(11):2522–2531. doi: 10.1158/1055-9965.EPI-14-0448

Table 5. Sitting watching TV and sitting at work in 1995 in relation to incidence of breast cancer overall and ER+ and ER- breast cancer.

	All breast cancer			ER+ breast cancer		ER- breast cancer

Hrs/day	Cases	Person years	IRR (95% CI)	Cases	IRR (95% CI)	Cases	IRR (95% CI)
TV
<1	158	72,748	1.00 (Ref.)	84	1.00 (Ref.)	43	1.00 (Ref.)
1-2	540	236,342	1.05 (0.88, 1.26)	288	1.06 (0.83, 1.35)	161	1.18 (0.84, 1.65)
3-4	430	206,362	0.97 (0.80, 1.16)	212	0.90 (0.70, 1.17)	128	1.09 (0.77, 1.55)
5+	205	86,367	1.13 (0.91, 1.40)	88	0.94 (0.69, 1.28)	67	1.39 (0.94, 2.07)
			P_trend=0.66		P_trend=0.25		P_trend=0.24

Work
<1	260	110,837	1.00 (Ref.)	136	1.00 (Ref.)	71	1.00 (Ref.)
1-2	164	70,811	1.06 (0.87, 1.30)	89	1.06 (0.80, 1.39)	48	1.10 (0.76, 1.60)
3-4	257	105,176	1.15 (0.96, 1.37)	146	1.19 (0.94, 1.52)	56	0.89 (0.62, 1.27)
5+	635	301,221	1.05 (0.90, 1.22)	294	0.92 (0.74, 1.13)	211	1.19 (0.90, 1.57)
			P_trend=0.68		P_trend=0.26		P_trend=0.21

IRRs adjusted for age (single year), time period (questionnaire cycle), BMI (<25, 25-29, ≥30 ), years of education (≤ 12, 13-15, 16, ≥ 17), parity (0, 1, 2, ≥ 3), vegetable/fruit dietary pattern (quintiles), and meat/fried foods dietary pattern (quintiles), and vigorous activity; sitting watching TV adjusted for sitting at work and vice versa