Table 4.

Lung dosimetric parameters to predict radiation peneumonitis with an ROC curve

	AUC	95% CI	Z-statistic	P-value (area =0.5)	Youden index J	Associated criterion	Sensitivity	Specificity
MLD (cGy)	0.878±0.0829	0.680–0.975	4.559	<0.0001	0.6889	>1,027	88.9	80.0
V5 (%)	0.815±0.113	0.605–0.942	2.782	0.0054	0.7111	>44	77.8	93.3
V10 (%)	0.819±0.104	0.609–0.944	3.055	0.0022	0.6222	>29	88.9	73.3
V15 (%)	0.822±0.0985	0.613–0.947	3.270	0.0011	0.6000	>27	66.7	93.3
V20 (%)	0.889±0.0771	0.694–0.979	5.044	<0.0001	0.7111	>22	77.8	93.3
V30 (%)	0.881±0.0692	0.684–0.976	5.514	<0.0001	0.6000	>17	66.7	93.3

Abbreviations: ROC, receiver operating characteristic; AUC, area under the curve; CI, confidence interval; MLD, mean lung dose.