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Table 1 Association between early menopause (40–44 years) and selected variables

From: Early menopause, association with tobacco smoking, coffee consumption and other lifestyle factors: a cross-sectional study

Variables % with early menopause and total number that answered Crude OR 95% CI
  % N   Lower Upper
Marital status
Married 8.5 1186 Ref.   
Unmarried 7.4 204 0.79 0.45 1.39
Widowed 15.2 171 1.89 1.18 3.02
Divorced or separated 10.9 558 1.32 0.94 1.86
Parity
0 9.9 304 Ref.   
1–3 9.8 1618 1.03 0.68 1.56
>3 7.1 168 0.72 0.36 1.45
Age at menarche
12–15 9.1 1773 Ref.   
<12 12.5 168 1.44 0.88 2.35
>15 11.5 182 1.36 0.83 2.22
Years of education
<8 18.4 163 Ref.   
8–10 10.3 630 0.51 0.32 0.82
11–12 9.6 426 0.50 0.30 0.83
>12 7.3 874 0.37 0.23 0.60
Social participation
Low 11.3 964 Ref.   
Medium 8.3 931 0.72 0.53 0.98
High 5.4 148 0.49 0.23 1.04
Self reported health
Good 7.8 1354 Ref.   
Bad 12.9 728 1.83 1.36 2.47
Body mass index
18.5–24.9 9.3 965 Ref.   
<18.5 16.8 18 1.95 0.55 6.98
25.0–29.9 9.8 724 1.12 0.81 1.56
≥30 9.5 367 1.13 0.74 1.70
Physical activity (hours per week)
0 10.7 844 Ref.   
<1 8.7 412 1.02 0.59 1.75
1–2 7.6 406 0.79 0.43 1.44
≥3 10.8 167 0.70 0.38 1.30