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Table 2 Pregnancy rates by day of embryo transfer

From: Pregnancy rates of day 4 and day 5 embryos after culture in an integrated time-lapse incubator

  Day 4 transfers Day 5 transfers p-value
positive pregnancy test/ embryo transfer 62/124 (50.0%) 252/475 (53.1%) ns (p = 0.547)
positive pregnancy test/ embryo transfer after transfer of 1 embryo 3/12 (25.0%) 30/82 (36.6%) ns (p = 0.531)
positive pregnancy test/ embryo transfer after transfer of 2 embryos 58/110 (52.7%) 220/387 (56.8%) ns (p = 0.448)
positive pregnancy test/ embryo transfer after transfer of 3 embryos 1/2 (50.0%) 2/6 (33.3%) ns (p = 1.0)
clinical pregnancy/ embryo transfer 56/124 (45.2%) 217/475 (45.7%) ns (p = 1.0)
clinical pregnancy/ embryo transfer after transfer of 1 embryo 3/12 (25.0%) 25/82 (30.5%) ns (p = 1.0)
clinical pregnancy/ embryo transfer after transfer of 2 embryos 52/110 (47.3%) 190/387 (49.1%) ns (p = 0.747)
clinical pregnancy/ embryo transfer after transfer of 3 embryos 1/2 (50.0%) 2/6 (33.3%) ns (p = 1.0)
ongoing pregnancy/ embryo transfer 54/124 (43.5%) 198/475 (41.7%) ns (p = 0.759)
ongoing pregnancy/ embryo transfer after transfer of 1 embryo 3/12 (25.0%) 21/82 (25.6%) ns (p = 1.0)
ongoing pregnancy/ embryo transfer after transfer of 2 embryos 50/110 (45.5%) 175/387 (45.2%) ns (p = 1.0)
ongoing pregnancy/ embryo transfer after transfer of 3 embryos 1/2 (50.0%) 2/6 (33.3%) ns (p = 1.0)
multiple pregnancies with > 1 positive heart beat after 6 weeks 11/124 (8.9%)
Twins: N = 11
Triplets: N = 0
62/475 (13.1%)
Twins: N = 61
Triplets: N = 1
ns (p = 0.280)
implantation rate per embryo (no of gestational sacs/no of transferred embryos) 70/238 (29.4%) 288/874 (33.0%) ns (p = 0.310)
  1. ns non-significant, s significant (with p < 0.05)