Characteristics of the initial sample
| CHD | BMT | Healthy | |
| Sample | |||
| Children recruited | 47 | 51 | 51 |
| Initial assessments | 47 | 47 | 51 |
| Follow up assessments | 35 | 28 | 35 |
| Lost to follow up | 7 | 3 | 16 |
| Died | 5 | 20 | 0 |
| Age (years) | |||
| Range | 3.5–14.8 | 3.6–16.7 | 3.8–16.8 |
| Mean | 7.4 | 8.7 | 8.8 |
| SD | 3.2 | 3.4 | 3.4 |
| Sex | |||
| Male | 20 (43%) | 25 (49%) | 25 (49%) |
| Female | 27 (57%) | 26 (51%) | 26 (51%) |
| Socioeconomic status | |||
| Non-manual | 25 (53%) | 25 (49%) | 27 (53%) |
| Manual | 22 (47%) | 26 (51%) | 24 (47%) |
BMT, bone marrow transplantation; CHD, congenital heart disease.