Table 1.

Baseline characteristics of participants in the Nurses’ Health Study [NHS] and NHSII according to smoking status¹.

	Smoking status
	Never [n = 125857]	Past [n = 51547]	Current [n = 53582]
NHS, n	50 851	26942	38149
NHSII, n	75006	24605	15433
Age in years, mean [SD]	37.8 [7.2]	39.5 [7.0]	40.6 [7.3]
Body mass index, mean [SD]	24.1 [4.8]	24.1 [4.6]	23.5 [4.2]
White race, %	95.3	97.7	97.2
Oral contraceptive use, %
Never	33.7	31.9	39.4
Ever	66.3	68.1	60.6
Post-menopausal, %	15.1	18.2	25.2
Menopausal hormone therapy use2, %
Past	15.8	17.4	18.7
Current	28.5	30.0	26.3
Regular NSAID use3, %	18.1	20.8	24.1
Diabetes4, %	1.2	1.3	1.4

¹Baseline data derived from 1976 questionnaire for NHS and 1989 questionnaire for NHSII for all data except for race. Race derived from 1992 and 2004 questionnaires for NHS, and 1989 and 2005 questionnaires for NHSII.

²Amongst post-menopausal women.

³NSAID = non-steroidal anti-inflammatory drug; amongst patients in the NHSII 1989 questionnaire. NSAID data not available at baseline [1976 questionnaire] for patients in NHS. Regular use is defined as ≥2 tablets per week.

⁴Type I or type II.