Table 2.

JAFROC figure of merit and FPPI of the DLD system and observers

	JAFROC figure of merit				FPPI
	Session 1	p-value (vs. DLD)	Session 2	p-value (vs. session 1)	Session 1	Session 2	p-value
DLD system	0.836				0.20
Thoracic radiologists	0.895	0.006*	0.932	< 0.001*	0.17 (104/600)	0.12 (73/600)	< 0.001*
Non-thoracic radiologists	0.850	0.777	0.860	> 0.999	0.12 (72/600)	0.08 (47/600)	< 0.001*
Radiology residents	0.806	0.204	0.862	0.009*	0.19 (232/1200)	0.12 (140/1200)	< 0.001*

DLD Deep learning-based nodule detection, FPPI False-positive findings per image, JAFROC Jackknife alternative free-response receiver operating characteristic

^*p < 0.05 was regarded as statistically significant. For group-averaged comparison, corrected p-values are presented (multiplied by 3)