Table 6 Results from logistic regression analyses for the associations between preterm birth status and events related to menarche and menopause

Menarche-related

Were periods regular

Unadjusted (n=86,407)

0.79 (0.71-0.88)

1.00 (Ref)

< 0.0001

Adj. for demographics (n=82,992)

0.82 (0.73-0.91)

1.00 (Ref)

0.0003

Adj. for demographic and lifestyle factors (n=72,581)

0.81 (0.72-0.92)

1.00 (Ref)

0.0007

Menopause-related

Ever had premenopausal hot flashes

Unadjusted (n=86,857)

0.93 (0.82-1.04)

1.00 (Ref)

0.18

Adj. for demographics (n=83,418)

0.94 (0.83-1.05)

1.00 (Ref)

0.27

Adj. for demographic and lifestyle factors (n=72,898)

0.96 (0.85-1.09)

1.00 (Ref)

0.52

Ever had postmenopausal hot flashes

Unadjusted (n=58,721)

1.10 (0.99-1.23)

1.00 (Ref)

0.08

Adj. for demographics (n=56,411)

1.04 (0.93-1.17)

1.00 (Ref)

0.45

Adj. for demographic and lifestyle factors (n=49,326)

1.05 (0.93-1.18)

1.00 (Ref)

0.47

Ever had an oophorectomy

Unadjusted (n=85,769)

1.14 (1.03-1.25)

1.00 (Ref)

0.009

Adj. for demographics (n=82,409)

1.15 (1.05-1.27)

1.00 (Ref)

0.004

Adj. for demographic and lifestyle factors (n=72,078)

1.13 (1.01-1.25)

1.00 (Ref)

0.03

Ever had a hysterectomy

Unadjusted (n=86,849)

1.08 (0.99-1.18)

1.00 (Ref)

0.07

Adj. for demographics (n=83,414)

1.08 (0.99-1.18)

1.00 (Ref)

0.10

Adj. for demographic and lifestyle factors (n=72,850)

1.07 (0.97-1.18)

1.00 (Ref)

0.19