Variable

Beta

Standard error

P value


Intercept

2.241

0.085
 
Case status

0.130

0.048

0.008

Body mass index (postmenopausal)^{b}

0.0033

0.0003

<0.001

Birth index^{c}

0.0021

0.0006

<0.001

Duration of natural menopause

0.015

0.004

<0.001

Duration of menopause after bilateral oophorectomy

0.013

0.004

0.004

R
^{2} = 0.219
   

^{a}Based on 164 cases and 346 controls. ^{b}Duration postmenopause × average body mass index postmenopause. ^{c}Birth index = $\sum _{i=1}^{st}({t}_{m}{t}_{i}}){b}_{it$ if parous and = 0 if nulliparous where s = parity; t
_{
i
}= age at ith birth, i = 1, ..., s; t
_{
m
}= age at menopause; and b
_{
it
}= 1 if parity is greater than or equal to i at age t and = 0 otherwise.