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The relationship between serum P4 and cycle follicle outcomes in the various infertile groups. (A) Serum from each infertile group was collected, and serum P4 was analyzed by radioimmunoassay (RIA). (B) The serum P4 per follicle was compared in the various infertile groups of each patient group. The p-value for each group versus the male factor group was determined by an unpaired t-test.
