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 cancerER+ breast cancerER breast cancer
h/wk Exerciseh/d SittingCasesPerson-yearsIRRa (95% CI)CasesPerson-yearsIRR (95% CI)CasesPerson-yearsIRR (95% CI)
<1<518472,6461.14 (0.78–1.66)9872,5460.89 (0.57–1.42)4872,4971.45 (0.65–3.22)
<15–9352139,4611.24 (0.87–1.78)180139,2680.93 (0.60–1.45)104139,2001.73 (0.80–3.72)
<110+20083,6251.22 (0.84–1.78)8683,4950.79 (0.49–1.26)6683,4771.89 (0.86–4.16)
1–4<510446,3941.12 (0.75–1.65)6046,3460.94 (0.58–1.52)2446,3061.20 (0.51–2.78)
1–45–9206101,3051.11 (0.77–1.61)109101,2020.86 (0.55–1.35)59101,1541.46 (0.66–3.19)
1–410+9650,5551.10 (0.74–1.64)4150,4960.69 (0.41–1.16)3450,4891.80 (0.79–4.07)
5+<53316,8241.00 (Ref.)2316,8141.00 (Ref.)716,7921.00 (Ref.)
5+5–96034,8560.96 (0.63–1.47)2734,8160.63 (0.36–1.10)2434,8121.76 (0.76–4.09)
5+10+2920,1770.85 (0.51–1.40)1420,1590.62 (0.32–1.20)920,1541.18 (0.44–3.18)
  • aIRRs adjusted for age (single year), time period (questionnaire cycle), BMI (<25, 25–29, ≥30 kg/m2), 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).