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Table 1 Demographics and Patient Characteristics

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

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
  1. * 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).
  2. ** Index ADHD, first ADHD in post period, or prior period diagnosis closest to the index date, in that order.
  3. ***Psychological and Neuropsychological Testing are from prior and post periods.