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Table 4 FHB+ rates (%) in each KS-D5 group stratified by SART maternal age

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

  1.0–3.6* 3.7–6.0* 6.1–8.0* 8.1–9.9* No. of cycles P value for
trend test
<  35 26.5 38.2 41.0 50.0 295 <  0.05
35–37 20.2 31.8 39.4 52.2 405 <  0.05
38–40 13.1 21.2 33.3 38.5 613 <  0.05
41–42 8.6 14.6 23.1 36.4 490 <  0.05
≥ 43 3.1 6.6 12.9 27.7 682 <  0.05
Total 10.7 17.8 28.6 41.0 2482 <  0.05
  1. FHB+ Fetal heart beat positive, AUC Area under the curve for prediction of FHB+, KS-D5 KIDScore Day5
  2. * An asterisk indicates that the FHB+ rates significantly decreased when maternal age increased for each column according to the Cochran-Armitage trend test (P <  0.05)