Females (n=308) Females (n=308) Males (n=216)
Age, mean (±SD) 37.3 (±4.6) 38.4 (±6.2)
BMI, mean (±SD) 24.5 (±3.1) 24.2 (±3.3)
Smoking, n (%) 56 (18.2) 37 (17.2)
Ethnicity, n (%)
White 279 (90.6) 198 (91.7)
Asian 9 (2.9) 4 (1.9)
Hispanic 13 (4.2) 8 (3.7)
Black 7 (2.3) 6 (2.8)
Previous children, median (range) 0 (0-3) 0 (0-2)
Highest education n (%)
Postsecondary and tertiary 124 (40.3) 81 (37.5)
Upper secondary 146 (47.4) 112 (51.9)
Lower secondary of less 38 (12.3) 23 (10.6)
Couples (n=187) Couples (n=187) Couples (n=187)
Heterologous fertilization n (%) 56 (29.9%) 56 (29.9%)
Previous failed IVF cycle, median (range) 2 (0-8) 2 (0-8)
Duration of infertility, mean (%) 3.6 (±2.1) 3.6 (±2.1)
Etiology of infertility, n (%)
Female factor 81 (43.3) 81 (43.3)
Male factor 62 (33.2) 62 (33.2)
Mixed 26 (13.9) 26 (13.9)
Unexplained 18 (9.6) 18 (9.6)