Table 3.

Diagnostic performance of the nomogram, FLI, HSI, and AIP for predicting NAFLD in the training and validation sets

Models	Training set (n = 1200)							Validation set (n = 1118)
	AUC (95%CI)	P	Youdan	Sensitivity	Specificity	PPV	NPV	AUC (95% CI)	P	Youdan	Sensitivity	Specificity	PPV	NPV
Nomogram	0.863 (0.840–0.886)	Ref	0.576	0.798	0.778	0.513	0.929	0.864 (0.841–0.887)	Ref	0.583	0.922	0.661	0.448	0.966
FLI	0.862 (0.838–0.886)	0.850	0.564	0.787	0.777	0.508	0.926	0.866 (0.843–0.889)	0.772	0.600	0.851	0.748	0.502	0.944
HSI	0.835 (0.808–0.862)	0.019	0.548	0.812	0.736	0.474	0.931	0.833 (0.806–0.859)	0.006	0.514	0.817	0.697	0.446	0.927
AIP	0.782 (0.752–0.811)	< 0.001	0.444	0.761	0.683	0.413	0.907	0.773 (0.746–0.808)	< 0.001	0.444	0.767	0.677	0.415	0.907

AUROC area under the receiver operating characteristics, PPV positive predictive value, NPV negative predictive value, NAFLD nonalcoholic fatty liver disease, FLI fatty liver index, HSI hepatic steatosis index, AIP atherogenic index of plasma, Ref reference