Table 2 Baseline patient characteristics in second ejaculation IVF and conventional IVF before and after propensity score matching
Baseline characteristics | Second ejaculation IVF n = 61 | Conventional IVF n = 2639 | P value | Matched-conventional IVF n = 238 | P value |
|---|---|---|---|---|---|
Female age | 33.50 ± 5.09 | 34.31 ± 7.71 | 0.413 | 33.26 ± 4.56 | 0.712 |
Male age | 36.10 ± 5.56 | 35.92 ± 5.94 | 0.823 | 35.68 ± 5.87 | 0.617 |
Number of oocytes retrieved | 10.00 (4.00, 13.00) | 9.00 (5.00,13.00) | 0.591 | 8.00 (5.00, 12.00) | 0.710 |
Ovarian stimulation protocol n (%) | |||||
 Long-acting protocol | 11 (18.0) | 509 (19.3) | 0.096 | 59 (24.8) | 0.307 |
 Short-acting protocol | 29 (47.5) | 913 (34.6) |  | 89 (37.4) |  |
 Others | 21 (34.4) | 1217 (46.1) |  | 90 (37.8) |  |
 Primary infertility (%) | 25 (41.0) | 988 (37.4) | 0.572 | 92 (38.7) | 0.740 |
 Secondary infertility (%) | 36 (59.0) | 1651 (62.6) |  | 146 (61.3) |  |
 Concentration after swim-up (million/mL) | 5.25 (3.75, 8.60) | 20.40 (9.90, 37.40) | < 0.001 | 5.20 (3.30, 9.90) | 0.904 |
 Progressive motility after swim-up (%) | 86.65 (76.40, 93.15) | 88.90 (79.50, 94.20) | 0.109 | 83.85 (72.30, 91.30) | 0.203 |
 Total progressive motile sperm count after swim-up (million) | 2.24 (1.52, 2.94) | 8.67 (4.06, 16.32) | < 0.001 | 2.13 (1.30, 3.55) | 0.777 |