Table 3.

Brisk walking at baseline in relation to breast cancer overall, ER+, and ER breast cancer

All breast cancerER+ breast cancerER breast cancer
h/wkCasesPerson-yearsIRRa (95% CI)CasesIRR (95% CI)CasesIRR (95% CI)
<11,086470,6381.00 (Ref.)5441.00 (Ref.)3101.00 (Ref.)
16731,6430.96 (0.75–1.22)361.02 (0.72–1.43)231.10 (0.72–1.68)
25932,6620.79 (0.61–1.03)340.88 (0.62–1.25)140.63 (0.37–1.08)
3–47837,8840.88 (0.69–1.11)360.77 (0.55–1.09)301.17 (0.79–1.71)
5–64020,2990.84 (0.61–1.16)200.80 (0.51–1.27)161.14 (0.68–1.90)
7+2917,0570.77 (0.53–1.13)160.83 (0.50–1.38)100.88 (0.46–1.68)
Ptrend = 0.02Ptrend = 0.08Ptrend = 0.98

NOTE: Walking defined as brisk based on fairly brisk or brisk pace reported on the 2003 or 2005 questionnaire

  • 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), meat/fried foods dietary pattern (quintiles), and vigorous exercise (<1, 1–4, ≥5 h/wk).