Baseline characteristics
| Group 1 (age ⩽20) | Group 2 (age >20) | p Value (group I v II) | |
|---|---|---|---|
| Data presented as mean (SD) unless otherwise indicated. | |||
| NYHA, New York Heart Association; NS, non-significant difference. | |||
| Number of patients | 84 | 384 | |
| Sex (male) | 29 (34.5%) | 99 (25.8%) | NS |
| Age (years) | 16.7 (3.3) | 33.7 (9.5) | <0.0001 |
| Age range (years) | 10–20 | 21–61 | |
| Weight (kg) | 45 (10) | 62 (18) | <0.001 |
| Range | 20–68 | 46–85 | |
| Body surface area (m2) | 1.4 (0.17) | 1.6 (0.24) | <0.01 |
| Atrial fibrillation | 6 (7.1%) | 58 (15.1%) | 0.05 |
| NYHA class III/IV | 76 (90.4%) | 337 (87.8%) | NS |
| Mitral echo score | 7.5 (1.3) | 8 (1.1) | <0.001 |
| Previous surgical commissurotomy | 2 (2.4%) | 17 (4.4%) | NS |
| Mitral regurgitation (grade 1) | 18 (21.4%) | 127 (33.1%) | 0.05 |