Table 1.

Reproductive and non-reproductive characteristics of cases and controls in the New England Case-Control study, 1984-2008.

		Case		Control
Mean (SD)		Mean	SD	Mean	SD
Agea		52.3	12.4	52.3	12.7
BMI (kg/m2)		26.3	6.2	25.9	5.5
Age at menarche		12.7	1.7	12.8	1.7
Years of OC use		5.1	4.8	5.9	5
Parity (among parous)		2.5	1.3	2.7	1.4
Years breastfeeding (among parous)		0.5	0.9	0.7	1.2
Frequency (%)		N	%	N	%
Nulliparous	No	1538	67.9	1913	82.0
	Yes	727	32.1	420	18.0
Talc Use	No	1528	67.5	1698	72.8
	Yes	737	32.5	635	27.2
Oral contraceptive use	Never	1207	53.3	977	41.9
	Ever	1058	46.7	1356	58.1
Family history of ovarian cancer or early breast cancer	No	2060	91.0	2180	93.4
	Yes	205	9.1	153	6.6
Smoking status	Never	1047	46.2	1106	47.4
	Past	807	35.6	870	37.3
	Current	411	18.2	357	15.3
Menopausal status	Premenopausal	1011	44.6	1046	44.8
	Postmenopausal	1254	55.4	1287	55.2
Estrogen only use	Never	1129	90.0	1165	90.5
	Ever	125	10.0	122	9.5
Estrogen and Progesterone Use	Never	1086	86.6	1024	79.6
	Ever	168	13.4	263	20.4
Other PMH Use	Never	1247	99.4	1267	98.5
	Ever	7	0.6	20	1.6
Tubal Ligation	No	1975	87.2	1901	81.5
	Yes	290	12.8	432	18.5
Hysterectomy	None	2071	91.4	2128	91.2
	Simple Hysterectomy	138	6.1	132	5.7
	Hysterectomy with oophorectomy	56	2.5	73	3.1

^aFrequency matching factor