Table 5 Coding for predictor variables

Menopausal status

0: premenopausal

1: postmenopausal

Age at menopause

0: premenopausal or ≤ 45 years

1: 45.1–50.0 years

2: 50.1–55.0 years

3: > 55.0 years

Breastfeeding

0: parous women who never breastfed and

nulliparous women

1: 0.1–6 months

2: 6.1–12 months

3: > 12 months

Age at menarche

0: ≤ 11 years

1: 12 years

2: 13 years

3: 14 years

4: ≥ 15 years

Hormone replacement therapy (HRT) use

0: never used HRT

1: 0.1–1 year

2: 1.1–2 years

3: 2.1–3 years

4: > 3 years

Full-term pregnancy (FTP)

0: nulliparous

1: parous

Number of FTPs

0: nulliparous or 1 FTP

1: 2 FTPs

2: ≥ 3 FTPs

Age a first FTP

0: nulliparous or ≤ 20 years

1: 20.1–25.0 years

2: 25.1–30.0 years

3: 30.1–35.0 years

4: > 35.0 years

Body mass index

0: < 25.0 kg/m²

1: 25–29.9 kg/m²

2: 30–34.9 kg/m²

3: > 35.0 kg/m²

Body height per 10-cm increment

Body height in centimeters divided by 10, continuous variable

Alcohol intake

0: non-drinker

1: < 1 drink/day

2: 1.0–1.9 drinks/day

3: ≥ 2 drinks/day