Table 2 Demographic characteristics and FET parameters of the study population according to ongoing pregnancy
Parameters | Ongoing pregnancy (n = 350) | No ongoing pregnancy (n = 310) | p value |
|---|---|---|---|
Age, years | 29 (27, 32) | 30 (28, 34) | 0.001 |
BMI, kg/m2 | 21.8 (20.1, 24.0) | 22.2 (20.0, 25.0) | 0.113 |
Infertility type, n (%) | 0.751 | ||
Primary | 203 (58.0) | 176 (56.8) | |
Secondary | 147 (42.0) | 134 (43.2) | |
Infertility duration, years | 3.5 (2, 5) | 3 (2, 5) | 0.549 |
Infertility factor, n (%) | 0.349 | ||
Tubal factor | 164 (46.9) | 124 (40.0) | |
Male factor | 55 (15.7) | 57 (18.4) | |
Mixed male and female factor | 112 (32.0) | 112 (36.1) | |
Unexplained | 19 (5.4) | 17 (5.5) | |
Menstruation, n (%) | 0.902 | ||
Regular | 188 (53.7) | 168 (54.2) | |
Irregular | 162 (46.3) | 142 (45.8) | |
Initial day of estrogen usage | 11 (8, 13) | 10 (7, 13) | 0.387 |
Duration of estrogen usage, days | 11 (10, 15) | 11 (9, 15) | 0.331 |
Endometrial thickness at initial day of estrogen, mm | 5.0 (4.0, 5.7) | 4.8 (4.1, 5.8) | 0.879 |
Peak endometrial thickness, mm | 8.5 (7.8, 9.6) | 8.2 (7.6, 9.4) | 0.076 |
Optimal embryos transferred, n (%) | 321 (91.7) | 251 (81.0) | < 0.001 |