Table 1: Demographic and clinical variables in presumptive positive and negative childhood ADHD subjects as determined by Wender-Utah Rating Scale score.

ParameterADHD positive ( )ADHD negative ( )P value

Age (mean years ± SD) 0.09
Gender (M : F)5 : 8103 : 1940.78
Cognitive status (Normal : Impaired)10 : 3233 : 640.90
Education (mean ± SD) 0.31
CDR Sum of boxes (median)
 Normal cognition0.00.00.20§
 Impaired cognition3.50.50.03§
CDR Global score (median)
 Normal cognition0.00.00.28§
 Impaired cognition1.00.50.37§

Student’s t-test, 308 d.f.; χ 2 test, 1 d.f.; §Mann-Whitney U-test.