Research Article
DRD4 Gene Polymorphisms as a Risk Factor for Children with Attention Deficit Hyperactivity Disorder in Iranian Population
Table 2
Demographics of the study sample.
| Index | ADHD () | Control () | value |
| Age (year) | 6.883 ± 2.27 | 6.98 ± 2.50 | 0.3 | Gender (boy/girl) | 108/22 | 84/46 | <0.001 | Percentage of ADHD boys | 83 | 61 | 0.04 | Children of first-degree family marriage (%) | 56 | 4 | <0.001 |
|
|