Table 1.

Participant characteristics in the Nurses’ Health Study II (NHSII) and the Women’s Health Study (WHS) by migraine status at baseline (NHSII=1989, WHS=1993–1996).

	NHSII (1989)		WHS (1993–1996)
	No migraine (N=96,138, 85%)	Migraine (N=16,986, 15%)	No migraine (N=27,476, 82%)	Migraine (N=6014, 18%)
Mean (SD)
Age	34.6 (4.7)	35.5 (4.5)	54.6 (7.1)	53.3 (6.4)
BMI (kg/m2)	24.0 (4.9)	24.6 (5.3)	25.9 (5.0)	26.1 (5.1)
Percent
Family history of breast or ovarian cancer	7.2	7.6	8.2	8.4
Oral contraceptive use (NHS)
Never	17.3	13.7	--	--
<1 year	12.7	14.1	--	--
1–<5 years	38.4	39.6	--	--
5–<10 years	23.6	24.1	--	--
10+ years	8.0	8.4	--	--
Oral contraceptive use (WHS)
Never	--	--	31.6	26.2
<0.5 year	--	--	9.2	10.7
0.5–2 years	--	--	19.2	23.1
3–4 years	--	--	14.7	14.8
5+ years	--	--	25.3	25.2
Parity
Nulliparous	29.5	25.5	12.9	12.2
1 child	19.1	18.9	9.0	9.6
2 children	32.9	35.2	29.6	29.9
3 children	14.3	15.6	24.1	24.8
4+ children	4.3	4.8	24.4	23.5
Alcohol use
None	37.0	39.5	43.7	46.3
0.1–<5 grams/day	42.6	43.4	31.7	33.8
5+ grams/day	20.4	17.2	24.6	19.9
Smoking status
Never	66.0	62.4	50.6	53.9
Past	21.0	22.8	36.3	34.0
Current	13.0	14.9	13.1	12.1
NSAID use
Never	75.2	57.4	89.0	84.3
Past	--	--	--	--
Current	24.8	42.6	11.0	15.7
Tubal ligation	15.0	19.4	16.8	17.9
Hysterectomy	3.0	6.6	20.8	25.5
Unilateral oophorectomy	0.7	1.6	5.4	6.5
Menopausal status
Premenopausal	99.0	98.7	32.3	34.1
Postmenopausal	0.4	0.5	47.0	39.2
Unknown	0.6	0.8	20.5	26.5
HT use*
E ever use	4.7	9.6	11.2	13.9
E+P ever use	40.2	39.8	18.6	18.1
Other HT ever use	15.5	20.5	13.6	15.6

^*Postmenopausal only