Table 4.

Logistic regression analyses indicating cognitive impairment of patients with ADHD without stimulant treatment (ADHD-OFF) compared to healthy controls (CG)

Predictor sets	χ2 model	df	p	R2 total	R2 higher order functionsd
Executive function
Model 1a	55.856	5	< .001*	.467
Model 2b	73.559	8	< .001*	.579	.274
Model 3c	74.026	9	< .001*	.584	.266
Memory
Model 1a	74.418	7	< .001*	.582
Model 2b	101.012	10	< .001*	.718	.414
Model 3c	102.497	11	< .001*	.733	.425
Complex attention
Model 1a	14.965	4	.005*	.150
Model 2b	40.149	7	< .001*	.366	.066
Model 3c	36.298	8	< .001*	.336	.039

The R² represents a summary measure reflecting the overall impairment in the various cognitive variables (see materials section “Distinction of basic and higher order cognitive processes”)

ADHD-OFF patients with ADHD without methylphenidate treatment, CG control group

*Statistically significant at p < .005

^aBasic model including only variables of higher order functions

^bModel with variables of processing speed entered in step 1 and variables of higher order functions entered in step 2

^cModel with variables of distractibility entered in step 1 and variables of higher order function entered in step 2

^dImpairment in higher order functions after controlling for impairments in lower order functions