Table 4

ORs and 95% CIs for the interaction of BMI and physical activity, for ER+/PR+ breast tumors in the studies of premenopausal and postmenopausal women, conducted in Los Angeles County, California

BMIPhysical activityaControlsCasesORb(95% CI)
Postmenopausal
Highc
02751481.00
0.1–17.52421150.89(0.66–1.21)
≥17.631150.85(0.44–1.66)
Low
0237790.57(0.41–0.80)
0.1–17.5252830.54(0.39–0.75)
≥17.654100.32(0.15–0.65)
P for interaction0.61
Premenopausal
High
058191.00
0.1–17.588290.98(0.50–1.93)
≥17.62570.86(0.32–2.34)
Low
089331.07(0.55–2.11)
0.1–17.5185580.83(0.45–1.55)
≥17.677150.54(0.25–1.18)
P for interaction0.61
  • a Average MET-hours/week of physical activity from menarche to reference age.

  • b Models include the following: postmenopausal study—age at reference year, socioeconomic status, number of full-term pregnancies, months of breastfeeding, age at menopause, hormone replacement therapy, family history, and alcohol consumption; premenopausal study—age at reference year, socioeconomic status, age at menarche, age at first full-term pregnancy, number of full-term pregnancies, months of breastfeeding, and family history.

  • c High: ≥23.7.