Characteristics of the sample
| CHD | BMT | Healthy | |
|---|---|---|---|
| Age (years) | |||
| Range | 0.2–3.4 | 0.3–3.4 | 0.3–3.5 |
| Mean | 1.5 | 1.8 | 1.9 |
| SD | 0.9 | 1.1 | 1.1 |
| Sex | |||
| Boys | 15 | 9 | 9 |
| Girls | 10 | 6 | 6 |
| Socioeconomic status | |||
| Non-manual | 12 (48%) | 6 (40%) | 6 (40%) |
| Manual | 13 (52%) | 9 (60%) | 9 (60%) |
CHD, congenital heart disease; BMT, bone marrow transplantation.