TABLE 1.
Clinical and Demographic Characteristics of Subjects
| Group |
p Value | ||
|---|---|---|---|
| ADHD N = 25 |
Control N = 24 |
||
| Gender | M=24, F=1 | M=23, F=1 | n/s |
| Age (y) | 12.48 (1.86) | 12.82 (1.69) | .52 |
| Weight (kg) | 42.84 (15.30) | 48.38 (11.87) | .17 |
| Duration of stimulant medication (mo) | 38.1 (23.7) | n/a | n/a |
| D′a | 1.16 | 1.68 | .012 |
| FSIQ | 89.84 (11.65) | 104.67 (14.74) | .0003 |
| Total digit span scaled | 7.72 (2.76) | 9.75 (3.05) | .018 |
| TOWRE: Total Score | 89.56 (22.34) | 98.63 (13.99) | .097 |
| Conners Parent DSM total | 81.40 (7.50) | 44.79 (6.17) | 4.21E-23 |
| SES classification (n) | .89 | ||
| Higher professional | 1 | 1 | |
| Lower professional | 5 | 5 | |
| Self-employed | 1 | 1 | |
| Manual/unemployed | 18 | 17 | |
| Co-morbid diagnoses | |||
| ODD | 11 | 0 | n/a |
| CD | 7 | 0 | n/a |
| DCD | 1 | 0 | n/a |
| RD | 1 | 0 | n/a |
| GAD | 3 | 0 | n/a |
| Depressionb | 1 | 0 | n/a |
| Specific phobia | 3 | 0 | n/a |
Note: Some subjects had more than one comorbidity. ADHD = attention-deficit/hyperactivity disorder; CD = conduct disorder; DCD = developmental coordination disorder; DSM = Diagnostic and Statistical Manual of Mental Disorders; FSIQ = full-scale intelligence quotient; GAD = generalized anxiety disorder; ODD = oppositional defiant disorder; RD = reading disorder; SES = socioeconomic status; TOWRE = Test of Word Reading Efficiency.
a
D prime scores are taken from a Go/No-go task using 24 matched pairs (ADHD participants off medication; Cohen's Dz effect size = 0.76).
b
Mild depressive episode.