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Table 2: Mann-Whitney analysis for symptomatic-versus-asymptomatic patients
Cohort of 100 Patients 66 Patients with CPE
PFD CPE PFD CPE
Average rank of first group 38,971 40,7246 22,5263 25,6711
Average rank of second group 76,1613 72,2581 48,3929 44,125
Mann-Whitney U 274 395 115 234.5
Test statistic Z (corrected for ties) 5936 5122 5418 3865
Two-tailed probability P < .001 P < .001 P < .001 P = .001

	Cohort of 100 Patients		66 Patients with CPE
	PFD	CPE	PFD	CPE
Average rank of first group	38,971	40,7246	22,5263	25,6711
Average rank of second group	76,1613	72,2581	48,3929	44,125
Mann-Whitney U	274	395	115	234.5
Test statistic Z (corrected for ties)	5936	5122	5418	3865
Two-tailed probability	P < .001	P < .001	P < .001	P = .001