TABLE 2.

Receiver‐operating characteristic (ROC) curves for AβX‐40, AβX‐42, and AβX‐42/AβX‐40 in plasma IP‐eluates for prediction of amyloid positivity by Aβ42/Aβ40 classification in CSF.

	tp	tn	fp	fn	ppv	npv	Sensitivity	Specificity	BACC	AUC
Aβ40	94	118	88	75	0.516	0.611	0.556	0.573	0.565	0.563
Aβ42	94	123	83	77	0.531	0.615	0.550	0.597	0.573	0.587
Aβ42/Aβ40	130	156	50	39	0.722	0.800	0.769	0.757	0.763	0.813
Aβ42/Aβ40 + ApoE ε4	147	150	53	22	0.735	0.872	0.870	0.739	0.804	0.865

Abbreviations: AUC, area under the curves; BACC, balanced accuracy; fn, false negative; fp, false positive; npv, negative predictive value; ppv, positive predictive value; tn, true negative; tp, true positive.