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Table 1 Patients characteristics for each maternal age group

From: Comparing prediction of ongoing pregnancy and live birth outcomes in patients with advanced and younger maternal age patients using KIDScore™ day 5: a large-cohort retrospective study with single vitrified-warmed blastocyst transfer

  <  35 35–37 38–40 41–42 ≥ 43 Total
Cycle, n 292 405 613 490 682 2482
Maternal age(± SD)at ER 32.1 ± 1.9 36.1 ± 0.8 39.2 ± 0.8 41.5 ± 0.5 44.3 ± 1.4 39.7 ± 4.1
Paternal age(± SD)at ER 35.0 ± 4.9 37.9 ± 4.3 40.6 ± 4.4 43.0 ± 4.6 45.0 ± 5.1 41.2 ± 5.7
No. of previous ER(± SD) 2.2 ± 2.0 a 2.9 ± 2.7 b 3.5 ± 3.5 c 4.5 ± 4.1 d 7.8 ± 7.2 e 4.7 ± 5.2
No. of previous ET(± SD) 1.6 ± 1.6 a 2.3 ± 2.4 b 2.7 ± 2.7 c 3.2 ± 2.9 d 4.3 ± 4.0 e 3.0 ± 3.2
Etiology of infertility (%)
 Male factor 29.7 25.4 25.9 27.5 21.6 25.4
 Tubal factor 2.1 5.0 4.5 5.8 5.7 4.9
 Endometriosis 5.5 3.8 4.2 2.6 3.7 3.8
 Ovulation disorders 4.1 a 3.3 ab 2.2 ab 0.9 b 2.3 ab 2.4
 Uterine or cervical factor 3.8 4.0 4.9 6.0 7.0 5.4
 Combination 15.5 a 13.6 a 12.4 ab 9.8 ab 8.0 b 11.3
 Unknown 39.0 a 44.3 ab 45.8 ab 47.3 ab 51.7 b 46.6
 Other 0.3 0.5 0.2 0.2 0.2 0.1
  1. The different letter has statistically significant differences across the maternal age groups (P <  0.05)
  2. ER Egg retrieval, ET Embryo transfer, SD Standard deviation, SE Standard error