Table 4.

Analysis of Thresholds from 1990 and 2000

True Positive Fractions	Non-SOS Condition	SOS Condition	F(1,18)	P	Significance Level
Most Conservative Threshold	0.443	0.389	9.47	0.0068	**
Most Lenient Threshold	0.597	0.519	19.81	0.0004	***
Center of Range	0.520	0.454	18.67	0.0005	***
Width of Range	0.154	0.130	2.03	0.1727

False Positive Fractions Reporting Non-Nodule Abnormality	Non-SOS Condition	SOS Condition	F(1,18)	P	Significance Level
Most Conservative Threshold	0.043	0.053	0.87	0.3636
Most Lenient Threshold	0.328	0.247	8.37	0.0101	*
Center of Range	0.185	0.150	5.52	0.0311	*
Width of Range	0.285	0.195	9.52	0.0067	**

^*indicates P < 0.05;

^**indicates P < 0.01;

^***indicates P < 0.001.