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Table 1 Results of oocyte retrieval 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
Planned OR, n 448 2751 6595 7600 2850 20244 -
Premature ovulations, n (%) 10 (2.23) 65 (2.36) 160 (2.43) 172 (2.26) 60 (2.11) 476 (2.35) - 0.46
Successful OR, n (%) 372 (83) 2243 (81.5) 5378 (81.5) 5838 (76.8) 1951 (68.5) 15782 (78) <0.0001
ORs with mature oocyte, n (%) 314 (70.1) 1957 (71.1) 4787 (72.6) 5171 (68) 1698 (59.6) 13927 (68.8) <0.0001
  1. a Cochran-Armitage test for trend.