Table 1.
Demographic Characteristics for the ADHD and Control Groups
| ADHD 24 months | LNCG 24 months | ADHD 36 months | LNCG 36 months | |
|---|---|---|---|---|
| Age (mean, sd) | 10.4 | 10.5 | 11.5 | 11.6 |
| .85 | 1.08 | 1.18 | .92 | |
| IQ (mean, sd) | 101.011 | 108.41 | ||
| 14.61 | 19.19 | |||
| Ethnicity (percentage Caucasian) | 60.8 | 62.8 | ||
| Sex (percentage male) | 80.3 | 81.0 | ||
| Primary Reporter (percentage mothers) | 86.4 | 94.8 | ||
| Family Income (percentage earning < 40,0000) | 35.3 | 22.7 | ||
| Percentage of each ADHD subtype | ||||
| No ADHD Diagnosis | 50.6 | 100.0 | 47.5 | 100.0 |
| Inattentive | 18.4 | 0.0 | 22.1 | 0.0 |
| Hyperactive/Impulsive | 6.7 | 0.0 | 7.1 | 0.0 |
| Combined | 23.9 | 0.0 | 23.0 | 0.0 |
| Percentage with specified psychological disorder | ||||
| Any Anxiety Disorder | 14.2 | 11.1 | 14.8 | 8.1 |
| Any Elimination Disorder | 7.3 | 4.5 | 6.0 | 2.9 |
| Tic | 4.8 | 1.0 | 4.6 | 1.1 |
| Any Mood Disorder | 2.3 | .7 | 2.1 | .7 |
| Any Eating Disorder | .4 | .3 | .6 | .4 |
| Oppositional Defiant Disorder/Conduct Disorder | 22.1 | 4.8 | 25.4 | 2.9 |
1
Cognitive testing was completed at baseline for the ADHD group.
Note: LNCG = Local, Normative Comparison Group; Any Anxiety Disorder includes: Simple Phobia, Social Phobia, Agoraphobia, Panic Disorder, Overanxious Disorder, Generalized Anxiety Disorder, Obsessive-Compulsive Disorder, and Separation Anxiety Disorder; Any Mood Disorder includes: Major Depression, Dysthmia, Mania, and Hypomania; Any Elimination Disorder includes: Enuresis (primary and secondary) and Encopresis.