Table 1 Baseline characteristics of the study population (N = 398)

Age (years), mean, SD, range

35.5 (4.43) 22–45

Ethnicity,N(%)

 White European

365 (92%)

 Asian

28 (7%)

 Others

5 (1%)

Highest education,N(%)

 School leaving exams

185 (46%)

 Undergraduate degree

139 (35%)

 Postgraduate degree

74 (19%)

BMI, mean, SD, range

24.7 (3.2) 18.2–32.5

Ever smoked,N(%)

104 (26%)

Alcohol (units per week), median, IQR, range

4 (1, 8) 0–27

Physical activity (times per week),N(%)

 Never

12 (3%)

 Once

29 (7%)

 Twice

86 (22%)

 3–4 times

239 (60%)

 5–7 times

25 (6%)

 7+ times

7 (2%)

Family history of cardiometabolic disease,N(%)

208 (52%)

Gravidity, median, IQR, range

0 (0, 1) 0–12

Parity, median, IQR, range

0 (0, 0) 0–4

Duration infertility (years), median, IQR, range

3 (2, 4) 1–13

Primary infertility,N(%)

271 (68%)

Cause of infertility

 Unexplained

203 (51%)

 Tubal disorder

44 (11%)

 Endometriosis

32 (8%)

 Ovulatory disorder

24 (6%)

 Male factor/no male partner

87 (22%)

 Others

8 (2%)

First IVF cycle (missing data,N = 3)

376 (95%)

AMH, median, IQR, range

16.1 (8.9, 28.0) 1–170.8

Total AFC, median, IQR, range

12 (7, 16) 0–40