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Table 1 Patient characteristics of group G and group GP before and after PS matching

From: Does the transfer of a poor quality embryo with a good quality embryo benefit poor prognosis patients?

Variable Before matching After matching
G (n = 4484) GP (n = 553) P G(n = 520) GP (n = 520) P
Maternal age 30 [27–33] 30 [27–33] 0.327 30.5 [28–34] 30 [27–33] 0.235
Paternal age 32 [29–35] 32 [29–36] 0.001 32 [29–36] 32 [29–35] 0.991
Duration of infertility 3.2 [2–5] 4 [2–6] 0.014 3.75 [2–6] 4 [2–6] 0.805
BMI (kg/m2) 20.8 [19.2–22.4] 20.8 [19.31–22.5] 0.47 21 [19.23–22.6] 20.8 [19.3–22.6] 0.77
PCOS (%) 427 (9.5) 43 (7.8) 0.183 44 (8.5) 41 (7.9) 0.734
Endometriosis (%) 396 (8.8) 58 (10.5) 0.199 57 (11) 54 (10.4) 0.763
Tubal factor (%) 2952 (65.8) 348 (62.9) 0.175 317 (61) 329 (63.3) 0.443
Male factor (%) 827 (18.4) 108 (19.5) 0.535 110 (21.2) 101 (19.4) 0.488
Parity (%)
 0 3736 (83.3) 471 (85.2) 0.268 427 (82.1) 443 (85.2) 0.18
 ≥ 1 748 (16.7) 82 (14.8) 93 (17.9) 77 (14.8)
Gravidity (%)
 0 2281 (50.9) 288 (52.1) 0.706 272 (52.3) 270 (51.9) 0.977
 1 1185 (26.4) 137 (24.8) 126 (24.2) 129 (24.8)
 ≥ 2 1018 (22.7) 128 (23.1) 122 (23.5) 121 (23.3)
Baseline FSH 6.52 [5.61–7.6] 6.58 [5.77–7.77] 0.056 6.66 [5.69–7.68] 6.67 [5.78–7.82] 0.573
AFC 12 [8–16] 11 [8–15] 0.005 11 [8–15] 11 [8–15] 0.869
Ovarian stimulation (%)
 Non-Agonist 386 (8.6) 63 (11.4) 0.03 68 (13.1) 62 (11.9) 0.574
 Agonist 4098 (91.4) 490 (88.6) 452 (86.9) 458 (88.1)
Insemination (%)
 IVF 3264 (72.8) 386 (69.8) 0.137 352 (67.7) 362 (69.6) 0.504
 ICSI 1220 (27.2) 167 (30.2) 168 (32.3) 158 (30.4)
Endometrial thickness 8.5 [7.6–9.8] 8.7 [7.8–9.8] 0.031 8.7 [7.7–10] 8.6 [7.8–9.8] 0.961
No.of blastocyst vitrified 3 [1–5] 1 [0–2] < 0.001 0 [0–2] 1 [0–2] 0.065
Cycles of ET (%)
 1 1872 (41.7) 66 (11.9) < 0.001 60 (11.5) 66 (12.7) 0.488
 2 1800 (40.1) 236 (42.7) 217 (41.7) 230 (44.2)
 ≥ 3 812 (18.1) 251 (45.4) 243 (46.7) 224 (43.1)
Endometrial Preparation (%)
 NC 2158 (48.1) 234 (42.3) < 0.001 212 (40.8) 224 (43.1) 0.726
 HRT 1644 (36.7) 142 (25.7) 148 (28.5) 139 (26.7)
 HRT with GnRHa 682 (15.2) 177 (32) 160 (30.8) 157 (30.2)
Day of blastocyst (%)
 Day5 4008 (89.4) 271 (49) < 0.001 281 (54) 270 (51.9) 0.494
 Day6 476 (10.6) 282 (51) 239 (46) 250 (48.1)
FBT with TQE (%) 2100 (46.8) 103 (18.6) < 0.001 109 (21) 100 (19.2) 0.486
  1. Data are presented as median [first quartile, third quartile] and n (%)
  2. PCOS Polycystic ovary syndrome, ET Embryo transfer, NC Natural cycle, HRT Hormone replacement therapy, FBT Frozen blastocyst transfer, TQE Top quality embryo, blastocysts graded as AA, AB and BA with expansion grade ≥ 4