Table 4. Comparison of reader performance for pneumothorax detection using conventional (first and second read) and additional edge enhanced radiographs (third read).

P-value has been calculated between second read AUC and third read AUC using the Hanley & McNeil method.

Reader	First Read AUC	Second Read AUC	Mean AUC	Third Read AUC	Change in AUC	p-value
R1	0.953	0.923	0.938	0.934	-0.40%	0.5870
R2	0.931	0.966	0.9485	0.955	0.65%	0.4217
R3	0.959	0.955	0.957	0.971	1.40%	0.2377
R4	0.961	0.95	0.9555	0.959	0.35%	0.5106
R5	0.865	0.827	0.846	0.88	3.40%	0.0270