All women
|
Age at menarche, years
|
≤ 12
|
1292
|
289
|
1.00
|
820
|
1.00
|
186
|
1.00
|
110
|
1.00
|
13
|
634
|
158
|
1.13 (0.90–1.41)
|
419
|
0.98 (0.84–1.16)
|
99
|
1.06 (0.81–1.40)
|
66
|
1.22 (0.88–1.69)
|
≥ 14
|
522
|
107
|
0.89 (0.69–1.14)
|
278
|
0.77 (0.64–0.92)
|
75
|
0.92 (0.68–1.24)
|
51
|
1.07 (0.75–1.53)
|
Trend P value
|
0.55
| |
0.009
| |
0.70
| |
0.56
|
P value for homogeneity of trends
|
0.19
| | | | | | |
Number of completed pregnancies
|
Never pregnant
|
250
|
68
|
1.00
|
224
|
1.00
|
56
|
1.00
|
31
|
1.00
|
Any completed pregnancies
|
1990
|
431
|
0.91 (0.67–1.24)
|
1104
|
0.79 (0.64–0.98)
|
263
|
0.82 (0.58–1.15)
|
176
|
0.78 (0.50–1.20)
|
1
|
399
|
98
|
0.95 (0.66–1.36)
|
277
|
0.92 (0.71–1.19)
|
84
|
1.17 (0.79–1.74)
|
50
|
1.02 (0.62–1.67)
|
2
|
709
|
168
|
0.98 (0.70–1.37)
|
438
|
0.81 (0.64–1.02)
|
109
|
0.88 (0.61–1.29)
|
59
|
0.69 (0.42–1.11)
|
≥3
|
882
|
165
|
0.84 (0.60–1.19)
|
389
|
0.64 (0.50–0.81)
|
70
|
0.53 (0.35–0.80)
|
67
|
0.65 (0.40–1.05)
|
Trend P value
| | |
0.26
| |
<0.0001
| |
<0.0001
| |
0.02
|
P value for homogeneity of trends
|
0.09
| | | | | | |
Only non-completed pregnancy
|
208
|
55
|
0.91 (0.60–1.38)
|
189
|
1.02 (0.76–1.35)
|
41
|
0.88 (0.55–1.39)
|
20
|
0.69 (0.38–1.26)
|
Parous women onlya,b
|
Age at first completed pregnancy, years
|
≤20
|
799
|
165
|
1.00
|
297
|
1.00
|
69
|
1.00
|
62
|
1.00
|
21–24
|
510
|
107
|
1.03 (0.78–1.38)
|
274
|
1.22 (0.98–1.52)
|
63
|
1.18 (0.80–1.73)
|
43
|
1.05 (0.68–1.62)
|
25–29
|
348
|
85
|
1.08 (0.77–1.52)
|
275
|
1.64 (1.28–2.10)
|
56
|
1.22 (0.78–1.89)
|
33
|
1.10 (0.66–1.85)
|
≥30
|
333
|
73
|
0.80 (0.54–1.20)
|
256
|
1.17 (0.88–1.55)
|
75
|
1.09 (0.68–1.74)
|
38
|
0.96 (0.55–1.70)
|
Trend P value
| | |
0.50
| |
0.05
| |
0.57
| |
0.95
|
P value for homogeneity of trends
|
0.24
| | | | | | |
Duration of breastfeeding, months
|
Never
|
748
|
166
|
1.00
|
370
|
1.00
|
81
|
1.00
|
60
|
1.00
|
Ever
|
1242
|
264
|
0.80 (0.63–1.02)
|
732
|
0.78 (0.65–0.94)
|
182
|
0.89 (0.65–1.23)
|
116
|
0.91 (0.63–1.32)
|
< 6
|
541
|
134
|
0.96 (0.74–1.26)
|
303
|
0.83 (0.68–1.02)
|
82
|
0.99 (0.70–1.41)
|
35
|
0.68 (0.43–1.07)
|
6–11
|
263
|
40
|
0.55 (0.37–0.82)
|
165
|
0.76 (0.59–0.99)
|
35
|
0.70 (0.44–1.12)
|
33
|
1.28 (0.78–2.09)
|
≥ 12
|
438
|
90
|
0.69 (0.50–0.96)
|
264
|
0.71 (0.56–0.90)
|
65
|
0.85 (0.56–1.30)
|
48
|
1.10 (0.69–1.75)
|
Trend P value
| | |
0.006
| |
0.004
| |
0.28
| |
0.36
|
P value for homogeneity of trends
|
0.08
| | | | | | |