Table 3.  Odds ratios and 95% confidence intervals for breast cancer incidence in relation to vigorous recreational physical activity (average hrs/week/year) during four periods of life by menopausal status.

  Physical 

  

Premenopausal women

Postmenopausal women

  activity

Ages

Cases

Controls

OR†(95%CI)

OR††(95%CI)

Cases

Controls

OR†(95%CI)

OR††(95%CI)

Inactive
<1.7
1.7-4.5
>4.5
P for trend

14-20

150
72
51
37

162
110
115
88

1.00
.68(.47-.99)
.47(.31-.70)
.42(.26-.60)
<.0001

1.00
.81(.55-.39)
.65(.40-1.05)
.65(.38-1.12)
.036

340
117
61
30

280
104
102
124

1.00
.93(.68-1.26)
.49(.34-.70)
.20(.13-.30)
<.0001

1.00
.90(.61-.33)
.55(.35-.86)
.26(.15-.44)
<.0001

Inactive
<.56
.56-1.8
>1.8
P for trend

21-34

211
36
36
27

225
86
83
81

1.00
.43(.28-.67)
.44(.28-.68)
.33(.20-.53)
<.0001

1.00
.55(.32-.92)
.50(.30-.85)
.33(.18-.62)
<.0001

417
71
28
32

392
69
74
75

1.00
.96(.67-1.36)
.40(.26-.61)
.35(.22-.56)
<.0001

1.00
1.16(.74-.82)
.60(.34-1.04)
.49(.28-.83)
.037

Inactive
<.49
.49-1.74
>1.74
P for trend

35-50

205
39
31
35

260
71
71
73

1.00
.73(.47-.13)
.56(.35-.89)
.59(.40-.93)
.0024

1.00
.68(.41-1.15)
.63(.37-1.08)
1.02(.59-1.77)
.30

414
59
38
37

420
65
65
60

1.00
.91(.63-1.34)
.58(.40-.89)
.60(.39-.93)
.0024

1.00
1.00(.60-.69)
.72(.42-1.22)
.93(.53-1.61)
.30

Inactive
<.52
.5.2-1.74
>1.74
P for trend

>50
 
 
 
 

473
32
26
17

478
40
50
42

1.00
.83(.51-1.34)
.53(.32-.86)
.40(.23-.72)
.0001

1.00
.80(.44-.45)
.58(.29-.16)
.52(.27-.97)
.013

OR – odds ratios; CI – 95% confidence interval. † - Adjusted for age. †† Adjusted for age, body mass index, parity, breast-feeding, family history of breast cancer, fruits and vegetable consumption, active and passive smoking, household and occupational physical activity, and moderate recreational activity.