Table 4.

Comparison between the ROC curves of five models.

Variable	AUC difference	S.E.	Z	95% CI	Sig.
PCT vs. SCMM-CD4	0.193	0.045	4.29	0.105–0.281	<0.001***
PCT vs. SCMM-CD8	0.141	0.048	2.96	0.048–0.023	0.003**
PCT vs. PCT+SCMM-CD4	0.021	0.039	5.71	0.145–0.297	<0.001***
PCT vs. PCT+SCMM-CD8	0.175	0.038	4.63	0.101–0.249	<0.001***
SCMM-CD4 vs. SCMM-CD8	0.052	0.024	2.13	0.004–0.100	0.032*
SCMM-CD4 vs. PCT+SCMM-CD4	0.028	0.013	2.16	0.003–0.054	0.030*
SCMM-CD4 vs. PCT+SCMM-CD8	0.018	0.025	0.711	−0.031–0.067	0.478
SCMM-CD8 vs. PCT+SCMM-CD4	0.080	0.026	3.050	0.029–0.132	0.002**
SCMM-CD8 vs. PCT+SCMM-CD8	0.034	0.017	1.995	0.001–0.068	0.046*
PCT+SCMM-CD4 vs. PCT+SCMM-CD8	0.046	0.021	2.231	0.006–0.087	0.026*

AUC, area under the curve; S.E., standard error around the Co-efficient for the constant; CI, confidence interval.

^*P <0.05;

^**P <0.01;

^***P <0.001; PCT, procalcitonin; SCMM, single-cell mitochondrial mass.