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Table 1 Sample size estimation using the diagnostic test

From: Endometriosis fertility index score maybe more accurate for predicting the outcomes of in vitrofertilisation than r-AFS classification in women with endometriosis

EFI score Pregnancy Total
Positive Negative
≥6 score a(44) b(47) a + b(91)
≤5 score c(23) d(47) c + d(70)
Total a + c(67) b + d(94) N(161)