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Table 1

RR of breast cancer in women according to combined levels of recreational physical activity in 1982–1984 and about 10 years earlier, in 1971–75: NHEFS

Activity levelPerson-years of observationNo. of casesMultivariate-adjusted RR (95% CI)a
All women    
 Consistently low 11,553 36 1.0 
 Moderate/inconsistent 30,429 86 0.92 (0.62–1.38) 
 Consistently high 8,799 16 0.58 (0.31–1.07) 
P for trend   0.107 
Women <50 yrs of age All women    
 Consistently low 4,082 1.0 
 Moderate/inconsistent 13,856 25 1.07 (0.46–2.51) 
 Consistently high 4,582 10 1.19 (0.43–3.30) 
P for trend   0.732 
Women ≥50 yrs of age All women    
 Consistently low 7,472 29 1.0 
 Moderate/inconsistent 16,574 61 0.87 (0.55–1.38) 
 Consistently high 4,218 0.33 (0.14–0.82) 
P for trend   0.026 
Activity levelPerson-years of observationNo. of casesMultivariate-adjusted RR (95% CI)a
All women    
 Consistently low 11,553 36 1.0 
 Moderate/inconsistent 30,429 86 0.92 (0.62–1.38) 
 Consistently high 8,799 16 0.58 (0.31–1.07) 
P for trend   0.107 
Women <50 yrs of age All women    
 Consistently low 4,082 1.0 
 Moderate/inconsistent 13,856 25 1.07 (0.46–2.51) 
 Consistently high 4,582 10 1.19 (0.43–3.30) 
P for trend   0.732 
Women ≥50 yrs of age All women    
 Consistently low 7,472 29 1.0 
 Moderate/inconsistent 16,574 61 0.87 (0.55–1.38) 
 Consistently high 4,218 0.33 (0.14–0.82) 
P for trend   0.026 
a

Models were adjusted for height, BMI at age 25 years, adult weight change (age 25 years to age at 1982–1984 interview), and sample design variables. Results were similar in unadjusted models.

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