Clinical symptoms and performance on the continuous performance test in children with attention deficit hyperactivity disorder between subtypes: a natural follow-up study for 6 months

Table 3 The structure of factors produced by principal components analysis of ADHD measures^a, ^b.

	Factor 1 (CPT distraction)	Factor 2 (CPT impulsivity)	Factor 3 (Clinical hyperactivity)	Factor 4 (Clinical inattention)
SNAP-IV
Inattention	0.08	0.07	0.36	0.79
Hyperactivity	0.09	0.08	0.85	0.29
ADHD-RS
Inattention	0.19	0.11	-0.06	0.89
Hyperactivity	0.18	0.06	0.93	-0.04
CPT
Omission	0.73	-0.06	0.19	0.34
Commission	-0.14	0.96	0.05	0.04
Hit RT	0.76	-0.43	-0.06	0.11
Hit RT SE	0.93	0.08	0.11	0.15
Variability	0.84	0.25	0.20	0.12
Detectability	0.21	0.90	0.09	0.16
Response style	0.68	0.02	0.03	-0.06

^aRotation Method: Varimax with Kaiser Normalization.^bAbsolute value of factor loadings greater than 0.50 for each variable in bold face type.
CPT = The Computerized Continuous Performance Test; SNAP-IV = the Swanson, Nolan, and Pelham, and Version IV Scale; ADHD-RS = ADHD Rating Scale; RT = reaction time; SE = Standard Error.

ISSN: 1471-244X