Figure 4 Receiver operating characteristic (ROC) curve for
direct KOH microscopy, nested PCR and RT-PCR against the
gold standard test (fungal culture) for the diagnosis of onychomycosis
(N= 80). KOH microscopy: n= 66 positive and n= 14
negative; Area Under the Curve (AUC) = 0.48, P < 0.001 Nested
PCR: n= 52 positive and n=28 negative; AUC =0.57,
P < 0.001. RT-PCR: n= 58 positive and n= 22 negative;
AUC = 0.67, P < 0.001.