Table 6. Vigorous exercise together with combined 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/wk Exercise	Hrs/day Sitting	Cases	Person years	IRR (95% CI)	Cases	Person years	IRR (95% CI)	Cases	Person years	IRR (95% CI)
<1	<5	184	72,646	1.14 (0.78, 1.66)	98	72,546	0.89 (0.57, 1.42)	48	72,497	1.45 (0.65, 3.22)
<1	5-9	352	139,461	1.24 (0.87, 1.78)	180	139,268	0.93 (0.60, 1.45)	104	139,200	1.73 (0.80, 3.72)
<1	10+	200	83,625	1.22 (0.84, 1.78)	86	83,495	0.79 (0.49, 1.26)	66	83,477	1.89 (0.86, 4.16)
1-4	<5	104	46,394	1.12 (0.75, 1.65)	60	46,346	0.94 (0.58, 1.52)	24	46,306	1.20 (0.51, 2.78)
1-4	5-9	206	101,305	1.11 (0.77, 1.61)	109	101,202	0.86 (0.55, 1.35)	59	101,154	1.46 (0.66, 3.19)
1-4	10+	96	50,555	1.10 (0.74, 1.64)	41	50,496	0.69 (0.41, 1.16)	34	50,489	1.80 (0.79, 4.07)
5+	<5	33	16,824	1.00 (Ref.)	23	16,814	1.00 (Ref.)	7	16,792	1.00 (Ref.)
5+	5-9	60	34,856	0.96 (0.63, 1.47)	27	34,816	0.63 (0.36, 1.10)	24	34,812	1.76 (0.76, 4.09)
5+	10+	29	20,177	0.85 (0.51, 1.40)	14	20,159	0.62 (0.32, 1.20)	9	20,154	1.18 (0.44, 3.18)

^*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)