Table 1B.

Reproductive and hormonal characteristics of women by case status.

	Cases (n = 267)		Controls (n = 226)		p-valuea
	Mean ± SD
Menstrual duration b (years)	31.2 ± 5.2		32.2 ± 5.1		0.09
Age at menopause b (years)	46.3 ± 5.0		46.9 ± 4.8		0.3
Age at menarche (years)	14.9 ± 1.7		14.7 ± 1.6		0.3
Number of pregnancies (gravidity)	5.1 ± 2.6		4.4 ± 2.4		0.003
Age at first birth c (years)	20.0 ± 3.5		19.8 ± 3.3		0.42
Age at first live birth c (years)	20.1 ± 3.6		19.8 ± 3.4		0.38
	N	%d	N	%d	p-valuea
Still menstruating (yes)	25	9.4	71	31.4	<0.0001
Age at menarche (years)					0.17
<14	46	17.2	50	22.1
14	58	21.7	62	27.4
≥15	134	50.2	101	44.7
Age at menopause (years)					<0.0001
Premenopausal	25	9.4	71	31.4
<45	61	22.9	39	17.3
45–49	98	36.7	55	24.3
≥50	71	26.6	52	23.0
Number of pregnancies (gravidity)					0.005
≤ 2	40	15.0	43	19.0
3–5	116	43.5	121	53.5
>5	111	41.6	62	27.4
Age at first birth (years)					0.8
Never Pregnant	15	5.6	10	4.4
<18	50	18.7	47	20.8
18–20	100	37.5	80	35.4
≥21	77	28.8	69	30.5
Age at first live-birth (years)					0.9
Never Pregnant	15	5.6	10	4.4
<18	50	18.7	47	20.8
18–20	98	36.7	80	35.4
≥21	79	29.6	69	30.5
Birth control use (ever)	29	10.9	39	17.3	0.04

SD, standard deviation; N, number of participants.

^aP-values generated by t-test or chi-square test; unknown category or missings excluded.

^bOnly among postmenopausal women.

^cOnly among women who reported being pregnant.

^dPercentages may not add up to 100 because of rounding and due to unknown categories (not shown).