|
Exposure*
|
Cases n
|
Controls n
|
OR (95% CI)†
|
|---|
|
Age at menarche
|
|
< 12
|
22
|
44
|
Referent
|
|
12 – 14
|
100
|
212
|
0.9 (0.5 – 1.7)
|
|
> 14
|
21
|
30
|
1.2 (0.6 – 2.7)
|
|
Number of live births
|
|
None
|
18
|
58
|
Referent
|
|
1
|
22
|
28
|
2.0 (0.9 – 4.6)
|
|
≥ 2
|
103
|
200
|
1.4 (0.7 – 2.6)
|
|
Age at first birth
|
|
< 20
|
25
|
44
|
Referent
|
|
20 – 29
|
86
|
159
|
1.2 (0.6 – 2.4)
|
|
≥ 30
|
14
|
25
|
1.2 (0.4 – 3.8)
|
|
Ever Breast Feeding
|
|
No
|
57
|
75
|
Referent
|
|
Yes
|
71
|
154
|
0.7 (0.4 – 1.0)
|
|
Menstrual status on reference date**
|
|
Menstruating
|
21
|
72
|
Referent
|
|
Post-menopausal and not using HRT
|
38
|
58
|
2.8 (1.1 – 7.1)
|
|
Menstrual status 10 years before reference date**
|
|
Menstruating
|
35
|
83
|
Referent
|
|
Post-menopausal and not using HRT
|
23
|
46
|
0.6 (0.2 – 1.9)
|
- * Reported exposure before reference date, which for a case and her two matched controls was the date the case had surgery for her meningioma.
- † Odds ratio (OR) and 95% confidence intervals (CI) estimated from multivariable conditional logistic regression including continuous age and three categories of education (high school or less, some college or trade school, and college graduate or graduate school) as confounding variables. None of the tests for linear trend was significant.
- ** Odds ratio (OR) and 95% confidence intervals (CI) estimated from multivariable unconditional logistic regression including continuous age and three categories of education (high school or less, some college or trade school, and college graduate or graduate school) as confounding variables.
