TABLE 4

Mann–Whitney U Test Results

	Detector 1				Detector 2
	Significance level, 0.1		Significance level, 0.5		Significance level, 0.1		Significance level, 0.5
Study interval	z	P	z	P	z	P	z	P
Entire study	−5.5624	<0.00001	−5.5624	<0.00001	−5.19875	<0.00001	−5.19875	<0.00001
First half	−1.34009	0.18024	−1.34009	0.18024	0.40806	0.6818	0.40806	0.6818
Second half	6.09634	<0.00001	6.09634	<0.00001	−7.28366	<0.00001	−7.28366	<0.00001