Table 3.

Category of analysis	Probability values (two tail)	Chi squared
Failed FDT between groups, nothing excluded	P = 1.39941E − 08 P < 0.00000001	32.20
Failed FDT between groups, exclude unreliable	P = 4.16763E − 07 P < 0.0000004	25.63
Failed FDT, exclude unreliable and pathology	P = 2.04065E − 06 P < 0.000002	22.56
Failed eyes OU or monocular between groups	P = 0.01	5.83
comparison of reliability between groups	P = 0.03	4.62
Comparison of pathology between groups	P = 0.40	0.72
Failed FDT, control unreliable/pathology/age	P = 0.0001	14.85