Skip to main content
. 2017 Feb 23;13:255–262. doi: 10.2147/TCRM.S129133

Figure 1.

Figure 1

Computation of the AUROC confirmed favorable discriminatory power of NDPM2.5 (AUROC =0.591±0.025; 95% CI, 0.54–0.64; P<0.001).

Notes: The optimal cutoff point for NDPM2.5 derived from the maximal value of the Youden index, was 116 days/12 months (sensitivity, 51%; specificity, 78%). Green line represents reference line. Blue line represents NDPM2.5.

Abbreviations: ROC, receiver operating characteristic; AUROC, area under the receiver operating characteristic; NDPM2.5, the number of days of mean 24-hour PM2.5 ≥35 μg/m3/12 months; CI, confidence interval; PM2.5, particulate matter with a diameter of <2.5 μm.