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Table 3 Pregnancy and live birth rates per embryo transfer according to age

From: Minimal ovarian stimulation combined with elective single embryo transfer policy: age-specific results of a large, single-centre, Japanese cohort

Age (years)
  ≤29 30-34 35-39 40-44 ≥45 Total pa
Fresh embryo transfer, n 159 931 1972 1428 412 4902 -
Clinical pregnancies, n (%) 53 (33.3) 324 (34.8) 507 (25.7) 179 (12.5) 4 (1) 1067 (21.8) <0.0001
Live births, n (%) 48 (30.2) 275 (29.5) 376 (19.1) 106 (7.4) 2 (0.5) 807 (16.5) <0.0001
Fresh blastocyst transfer, n 17 29 25 73 5 149 -
Clinical pregnancies, n (%) 6 (35.3) 15 (51.7) 9 (36) 20 (27.4) 2 (40) 52 (34.9) 0.29
Live births, n (%) 6 (35.3) 11 (37.9) 7 (28) 10 (13.7) 1 (20) 35 (23.5) 0.036
Vitrified embryo transfer, n 13 64 125 153 61 416 -
Clinical pregnancies, n (%) 5 (38.5) 33 (51.6) 38 (30.4) 18 (11.8) 2 (3.3) 95 (22.8) <0.0001
Live births, n (%) 4 (30.8) 24 (37.5) 30 (24) 12 (7.8) 0 (0) 70 (16.8) <0.0001
Vitrified blastocyst transfer, n 184 1024 2072 1489 165 4934 -
Clinical pregnancies, n (%) 93 (50.5) 553 (54) 998 (48.2) 471 (31.6) 33 (20) 2149 (43.6) <0.0001
Live births, n (%) 76 (41.3) 456 (44.5) 757 (36.5) 263 (17.7) 10 (6.1) 1562 (31.7) <0.0001
  1. a Cochran-Armitage test for trend.