Table 7.

Evaluation of CRP (first), CRP (second), velocity of CRP and IBI in patients with preterm premature rupture of membranes for prediction of delivery in 7 days using ROC analysis

	PPV	NPV	Cutoff*	Sensitivity	Specificity	AUC	%95 CI	p value
CRP (first)	0.71	0.35	7.56	58%	50%	0.57	0.50–0.65	0.045
CRP (second)	–	–	–	–	–	–	–	0.730
Velocity of CRP	–	–	–	–	–	–	–	0.630
IBI	0.79	0.32	37.3	67%	50%	0.62	0.55–0.69	0.002

A p value of 0.05 indicates a significant difference and statistically significant p values are in bold

^*Cutoff values were found according to Youden index

PPV positive predictive value, NPV negative predictive value, AUC area under the curve, CI confidence interval, CRP C-reactive protein, IBI inflammatory burden index