Baseline characteristics, by gender
| Females (n=73) | Males (n=114) | p Value | |
| Age, years | 35.1±14.9 | 34.8±15.1 | 0.916 |
| Social background | 0.953 | ||
| Basic school (n, %) | 14 (19) | 22 (19) | |
| Apprenticeship (n, %) | 36 (49) | 64 (56) | |
| College/university degree (n, %) | 12 (16) | 20 (18) | |
| Missing (n, %) | 11 (15) | 8 (7) | |
| Living situation | 0.776 | ||
| Living with parents (n, %) | 16 (22) | 27 (24) | |
| Living independently/with partner (n, %) | 56 (77) | 85 (75) | |
| Missing (n, %) | 1 (1) | 2 (2) | |
| Complexity of cardiac defect | 0.252 | ||
| Mild (n, %) | 28 (38) | 39 (34) | |
| Moderate (n, %) | 9 (12) | 25 (22) | |
| Severe (n, %) | 36 (49) | 50 (44) | |
| Functional class | 0.058 | ||
| NYHA I (n, %) | 44 (60) | 87 (76) | |
| NYHA II (n, %) | 23 (32) | 20 (18) | |
| NYHA III (n, %) | 6 (8) | 7 (6) | |
| Cyanotic heart disease (n, %) | 6 (8) | 5 (4) | 0.277 |
| Previous endocarditis (n, %) | 7 (10) | 6 (6) | 0.382 |
| Previous valve replacement (n, %) | 26 (36) | 40 (35) | 0.941 |
| Infective endocarditis risk | 0.658 | ||
| Moderate (n, %) | 36 (49) | 60 (53) | |
| High (n, %) | 37 (51) | 54 (47) | |
| Number of cardiac interventions in the past | 0.680 | ||
| None (n, %) | 16 (22) | 20 (18) | |
| 1 (n, %) | 20 (27) | 27 (24) | |
| 2 (n, %) | 17 (23) | 27 (24) | |
| 3–4 (n, %) | 20 (27) | 40 (35) |
NYHA, New York Heart Association.