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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: J Int Neuropsychol Soc. 2013 May 23;19(7):739–750. doi: 10.1017/S1355617713000507

Table 2.

Descriptive statistics for response variables summarized over all time points

Variable N NV Min Median Mean Max SD
Stroop Interference 819 4114 9.00 45.00 45.34 100.00 10.51
Symbol-Digit 819 4120 11.00 52.00 51.67 110.00 12.38
Trail Making Part A 817 2604 10.00 25.00 27.61 240.00 12.47
Trail Making Part B 817 2577 15.00 58.00 68.83 300.00 37.60
Putamen 623 1318 0.24 0.58 0.57 0.85 0.11
Caudate 623 1318 0.11 0.41 0.41 0.81 0.09
Frontal White 623 1318 7.95 12.93 12.90 18.67 1.45

Note. Putamen, caudate, frontal white are expressed as ratio to intracranial volume × 100; NV = total number of observations over all visits; N = sample size