TABLE VI.

U-test comparison of ratings between real and simulated tumors for each observer, testing for the hypothesis that real and simulated tumors have the same score distributions. AUC values are shown for each individual reader and for a MRMC analysis.

		U-test p values		Mean AUC (95% CI)
Reader	Years of experience	Nonspiculated	Spiculated	Nonspiculated	Spiculated
Reader 1	2	0.3	0.861	0.57 (0.42, 0.69)	0.49 (0.38, 0.60)
Reader 2	8	0.752	0.006	0.52 (0.37, 0.67)	0.69 (0.58, 0.78)
Reader 3	4	0.670	0.164	0.47 (0.32, 0.62)	0.57 (0.47, 0.68)
Reader 4	4	0.709	0.049	0.47 (0.34, 0.63)	0.61 (0.50, 0.71)
Reader 5	39	0.009	0.136	0.68 (0.55, 0.78)	0.58 (0.47, 0.68)
MRMC	—	—	—	0.54 (0.44, 0.65)	0.58 (0.50, 0.68)