Table 2.
Demographic and clinical characteristics of the sample by grade (n = 2835).
| 2nd grade (n = 1064) | 3rd grade (n = 1015) | 4th grade (n = 756) | |
|---|---|---|---|
| Age at session 1 (mean, SD) | 7.7 (0.33) | 8.7 (0.37) | 9.7 (0.36) |
| Gender (% girls) | 49.0 | 48.9 | 51.5 |
| Home socioeconomic vulnerability index (mean, SD) | 0.45 (0.20) | 0.45 (0.21) | 0.45 (0.21) |
| Maternal education (%) | |||
| Primary or less | 15.2 | 11.0 | 11.8 |
| Secondary | 24.7 | 28.0 | 34.0 |
| University | 60.1 | 61.0 | 54.2 |
| ADHD subtypes -DSM-IV, teachers forma (%) | |||
| No-ADHD | 90.0 | 90.6 | 88.0 |
| ADHD-inattentive | 6.13 | 6.18 | 6.41 |
| ADHD-hyperactive/impulsive | 1.1 | 1.6 | 2.5 |
| ADHD-combined | 2.7 | 1.6 | 3.1 |
ADHD, Attention Deficit Hyperactivity Disorder.
a
ADHD Criteria of Diagnostic and Statistical Manual of Mental Disorders, fourth edition. Teachers form.