Patient characteristics, comorbidities, and medication use for children with ADHD with and without a co-occurring reading disorder: A retrospective cohort study

Table 1 Demographics and Patient Characteristics

Variable	ADHD Only (N = 97, 703)		ADHD + RD (N = 265)
	N	%	N	%
Age*
0-5	6708	6.9	7	2.6
6-11	47970	49.1	169	63.8
12-17	43025	44.0	89	33.6
Sex
Male	69735	71.4	179	67.5
Female	27968	28.6	86	32.5
Insurance Type
Comprehensive	23216	23.8	63	23.8
Health Maintenance Organization (HMO)	29880	30.6	87	32.8
Point of Service (POS)	13715	8.4	31	11.7
Preferred Provider Organization (PPO)	29730	30.4	81	30.6
Consumer-Driven Health Plan	685	0.7	1	0.4
Missing/Unknown	477	0.5	2	0.8
U.S. Region
Northeast	5519	5.6	20	7.5
North Central	16394	16.8	32	12.1
South	26466	27.1	83	31.3
West	9357	9.6	16	6.0
Unknown	39967	40.9	114	43.0
ADHD Diagnosis Type**
ADHD Without Mention of Hyperactivity	28830	29.5	77	29.1
ADHD With Hyperactivity	68873	70.5	188	70.9
Testing***
Psychological Testing	7665	7.8	65	24.5
Neuropsychological Testing	873	0.9	15	5.7

* Age measured at index date. Mean age in the ADHD cohort was 10.8 years (std dev = 3.5 years; median = 11 years). Mean age in the ADHD + RD cohort was 10.2 years (std dev = 3.2 years; median = 10 years).
** Index ADHD, first ADHD in post period, or prior period diagnosis closest to the index date, in that order.
***Psychological and Neuropsychological Testing are from prior and post periods.

ISSN: 1753-2000