Table 3.

Multiple linear regression results.

	Dependent Variables
	CPRS Hyperactivity		CPRS Inattention		CTRS Hyperactivity		CTRS Inattention		Trail Making Test- A		WISC-R Digit Symbol		WISC-R Digit Span
Independent Variables	Beta	t	Beta	t	Beta	t	Beta	t	Beta	t	Beta	t	Beta	t
Gender	−.07	−1.8	−.01	−.31	−.13	−3.2*	−.10	−2.5**	.01	.31	.09	2.4**	.01	.14
Age	−.06	−1.6	.01	.18	−.18	−4.4*	−.08	−1.9	−.50	−13.3*	−.18	−4.6*	−.15	−3.8*
Hgb	−.01	−.21	.02	.50	−.01	−.14	−.06	−1.4	.01	.20	.01	.35	.02	.58
MCV	.02	.45	−.01	−.08	.06	1.4	.09	2.1**	.04	.88	−.01	−.18	−.01	−.22
RDW	−.05	−1.2	−.01	−.25	.01	.19	−.01	−.13	.07	1.9	−.04	−.94	−.04	−.84
Ferritin	−.12	−3.1*	−.05	−1.4	−.05	−1.3	.01	.12	.01	.26	.01	.22	.06	1.6
Subtype	−.04	−1.1	−.09	−2.4	.03	.63	−.01	−.29	−.02	−.40	−.03	−.79	−.02	−.50
Anxiety	−.06	−1.5	−.08	−1.9	−.11	−2.9*	−.08	−2.1**	.01	.09	.06	1.5	.06	1.5
LD	−.08	−2.0	.01	.24	−.05	−1.2	.10	2.4**	.07	2.0**	−.12	−3.2*	−.25	−6.6*
ODD/CD	.20	5.2*	.13	3.3*	.06	1.4	.03	.84	.01	.30	.00	−.01	−.04	−1.1

CPRS: Conners Parent Rating Scale, CTRS: Conners Teacher Rating Scale, Hgb: hemoglobin, MCV:mean corpuscular volume, RDW: red cell distribution width, WISC-R: Weschler Intelligence Scale for Children, Revised. LD: Learning Disorder, ODD/CD: Oppositional Defiant Disorder/Conduct Disorder.

^*p<.01;

^**p<.05.