Table I.

Anamnestic data of 301 women with spontaneous premature ovarian failure (POF).

Age at study (years)	57.8 ± 12.5
Duration of amenorrhea (years)	20.7 ± 11.6
Smoking status (n)
Never smoked	206 (68.4%, 62.8–73.6)
Former smoker	27 (9.0%, 6.1–12.9)
Current smoker	68 (22.6%, 18.1–27.8)
Height (cm)	163.0 ± 6.5
BMI (kg/m2)	28.9 ± 6.7
Waist-to-hip ratio	0.84 ± 0.08
Age at menarche (years)	13.8 ± 1.7
Length of menstrual cycle at age 25–35
25–29 days	174 (57.8%, 52.0–63.4)
≤20 days	8 (2.7%, 1.2–5.4)
21–24 days	57 (18.9%, 14.8–23.9)
30–35 days	12 (4.0%, 2.2–7.0)
>35 days	1 (0.3%, 0–2.1)
Irregular	25 (8.3%, 5.6–12.2)
Do not know	12 (4.0%, 2.2–7.0)
Duration of fertility (years)	23.6 ± 5.1
Age of 1st pregnancy (years)	22.5 ± 3.6
No. of pregnancies	3.6 ± 2.0
No. of live births	2.0 ± 1.1
Age at menopause (years)	37.2 ± 4.4

Data are means ± SD or count (percentage, 95% CI of percentage).