Table 1.

Baseline variables

	Current smokers (n=12)	Ex-smokers (n=25)	Never smokers (n=64)	P value
Age (years)	30 (25.5–33.0)	32.5 (31.0–33.5)	31.0 (28.0–33.0)	0.057
BMI	23.2 (21.8–26.2)	25.3 (20.8–28.3)	25.1 (22.1–27.8)	0.632
Ethnicity				0.208
White European	8	21	35
Asian	2	4	16
Afro-Caribbean	1	0	8
Others	1	0	5
Category of infertility				0.077
Anovulatory	4	1	11
Male	4	5	14
Tubal	2	0	9
Unexplained	1	14	20
Other	0	4	4
Ovarian surgery				0.659
No	12	23	60
Yes	0	1	1
PCOS/PCOM				0.351
No	7	17	42
Yes	5	4	20

Values expressed as median (IQR) or n.

BMI, body mass index; PCOM, polycystic ovarian morphology; PCOS, polycystic ovary syndrome.