Table 2.

Cognitive Performance in PSS patients and Controls^*

Test**	All PSS Mean (SD)	Controls Mean (SD)	P Value	Effect Size (Cohen’s d)
Trails B	56.56 (5.56)	58.21 (9.73)	0.424	0.234
Stroop	53.50 (9.84)	58.13 (9.16)	0.114	0.472
WCST	47.91 (9.24)	50.07 (6.99)	0.422	0.248
Similarities	57.13 (8.446)	64.12 (8.703)	0.007	0.772
Boston Naming test	54.08 (12.93)	56.94 (8.17)	0.406	0.245
DST	52.85 (8.52)	58.04 (6.02)	0.027	0.636
Controlled Oral Word Association	44.21 (8.69)	47.95 (8.38)	0.143	0.398
Trials A	58.02 (5.62)	59.63 (7.22)	0.371	0.263
Verbal Memory
HVLT-R Total	49.47 (7.62)	52.06 (8.27)	0.267	0.301
HVLT-R Delay	49.19 (8.83)	53.24 (8.45)	0.121	0.458
HVLT-R % retained	48.81 (9.13)	52.76 (7.82)	0.130	0.446

^*T scores were calculated using the standardized norms corrected for age and education available from test manuals. T scores have a mean of 50 and a SD of 10.

^**Stroop= Stroop Interference Test; WCST = Wisconsin Card Sorting Test; DST= Digit Symbol Test; HVLT-R= Hopkins Verbal Learning Test-Revised, total;