Table 6.

Contingency table for tumor necrosis factor (TNF-α) as the golden standard

	Endometriosis group	Control group	Total
TNF-α positive	38	20	58
TNF-α negative	34	54	88
Total	72	74	146
Sensitivity	0.527
Specificity	0.729
Positive predictive value*	0.178
Negative predictive value*	0.933

^*Calculated with the Bayesian approximation for case-control studies, assuming a endometriosis prevalence of 10%