Fig. 3From: Proenkephalin as a biomarker correlates with acute kidney injury: a systematic review with meta-analysis and trial sequential analysisThe positive and negative likelihood ratios of PENK diagnostic accuracy for AKI. AKI, Acute kidney injury; LR, likelihood ratio; NPV, negative predictive value; PENK, proenkephalin A 119-159; PPV, positive predictive valueBack to article page