Table 2

RR of breast cancer in women ≥50 years of age according to combined levels of recreational physical activity in 1982–1984 and about 10 years earlier, in 1971–75, stratified by median BMI in 1982–1984 and by adult weight gain: NHEFS

Activity levelMultivariate-adjusted RR (95% CI)a
Median BMI (1982–1984)Adult weight gain (kg; age 25 yrs to 1982–1984)
<25.1≥25.1Lost/Gained 4.9Gained 5–19.9Gained 20+
Consistently low1.01.01.01.01.0
Moderate/inconsistent0.97 (0.48–1.96)0.83 (0.46–1.49)0.61 (0.20–1.87)1.12 (0.53–2.38)0.86 (0.37–1.97)
Consistently high0.40 (0.13–1.28)0.26 (0.06–1.13)0.43 (0.08–2.28)0.45 (0.12–1.66)0.32 (0.04–2.50)
P for trend 0.158 0.085 0.284 0.343 0.314
  • a Models were adjusted for sample design variables.