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.