Table 1. Demographic data of the non-clinical and clinical groups.
| Variables | Non-clinical group | Clinical group | t/χ2 | P |
|---|---|---|---|---|
| No. of children | 397 | 97 | ||
| Age (M ± SD) | 9.25 ± 1.48 | 8.90 ± 1.77 | t = 1.58 | 0.10 |
| Sex | ||||
| Boys, No. (%) | 191 (48.1) | 73 (75.2) | ||
| Age (M ± SD) | 9.20 ± 1.52 | 8.91 ± 1.69 | t = 1.34 | 0.80 |
| Girls, No. (%) | 206 (51.9) | 24 (24.8) | ||
| Age (M ± SD) | 9.30 ± 1.44 | 9.16 ± 2.01 | t = 0.41 | < 0.01 |
| Parental education, yr (M ± SD) | ||||
| Father | 15.64 ± 0.50 | 14.61 ± 0.25 | t = 5.98 | < 0.001 |
| Mother | 15.42 ± 1.50 | 14.06 ± 2.33 | t = 6.71 | < 0.001 |
| Caretakers sharing a home, No. (%) | χ2 = 0.86 | 0.64 | ||
| Both parents | 355 (89.4) | 91 (93.8) | ||
| One parent | 25 (6.2) | 4 (4.1) | ||
| Other | 6 (1.5) | 2 (2.0) | ||
| Socioeconomic status* | χ2 = 83.50 | <0.001 | ||
| Upper & upper-middle | 39 (9.8) | 1 (0.1) | ||
| Middle | 333 (83.8) | 66 (68.0) | ||
| Lower-middle & lower | 15 (3.7) | 18 (18.5) | ||
| Psychiatric diagnosis, No. (%) | Attention Deficit Hyperactivity Disorder (ADHD) 47 (48.5) | |||
| Major Depressive Disorder 17 (17.5) | ||||
| ADHD+Oppositional Defiant Disorder 12 (12.4) | ||||
| Tourette's Disorder 10 (10.3) | ||||
| Selective Mutism 4 (4.1) | ||||
| Separation Anxiety Disorder 4 (4.1) | ||||
| Enuresis 2 (2.1) | ||||
| Mental Retardation 1 (1.0) | ||||
*Socioeconomic status was classified according to methods of Hollingshead and Redlich. M, mean; SD, standard deviation.