Table 4.

Contingency table for interleukin 1β as the golden standard

	Endometriosis group	Control group	Total
Interleukin β positive	32	8	40
Interleukin 1β negative	24	46	70
Total	56	54	110
Sensitivity	0.571
Specificity	0.851
Positive predictive value*	0.300
Negative predictive value*	0.947

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