Table 1.
Studies included in the Analyses.
| Study [Reference] | Patient group diagnosis | Male/Female/Both | Number of patients | Number of controls | Mean age of patients (years) | Patients receiving medication |
| Brieber et al [15] | ADHD (DSM-IV) | M | 15 | 15 | 13.1 | 10 prescribed methylphenidate |
| Carmona et al [16] | ADHD (DSM-IV TR) | B | 25 | 25 | 10.8 | All prescribed methylphenidate |
| McAlonan et al [17] | ADHD (DSM-IV) | M | 28 | 31 | 9.9 | All prescribed methylphenidate |
| Overmeyer et al [18] | ADHD (DSM-IV) | B | 18 | 16 | 10.4 | 16 prescribed methylphenidate, 1 desipramine, 1 D-amphetamine |
| Van't Ent et al [19] | High-low concordant twin pairs: Scored by attention problem scale of Child Behaviour Checklist (CBCL-AP) | B | 6 | 34 | 15.4 | Unmedicated |
| Van't Ent et al [19] | Discordant twin pairs: Scored by attention problem scale of Child Behaviour Checklist (CBCL-AP) | B | 10 | 10 | 15.0 | Unmedicated |
| Wang et al [20] | ADHD (DSM-IV) | M | 12 | 12 | 13.4 | Not stated |
| TOTAL | 114 | 143 |
All studies compared a patient group with a comparison group using voxel-based morphometry of gray matter in Magnetic Resonance Images (MRI).