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Table 1 Criteria of good-quality embryo

From: Prednisone for patients with recurrent implantation failure: study protocol for a double-blind, multicenter, randomized, placebo-controlled trial

Embryo

Scoring system

Criteria of good quality

Blastocyst

Gardner

≥ 4 BC

Cleavage (day 3)

Puissant

7–10 cell 3; 4 or compact

Peter

7–10 cell I; II or compact