Baseline characteristics of CONCOR patients (n=5798)
| No | % of all patients | |
| Age (years) | ||
| <20 | 237 | 4 |
| 20–30 | 2044 | 35 |
| 30–40 | 1585 | 27 |
| 40–50 | 927 | 16 |
| ≥50 | 1005 | 17 |
| Male gender | 2862 | 49 |
| Ethnicity | ||
| Native Dutch | 5130 | 88 |
| Non-native Western | 405 | 7 |
| Non-Western | 263 | 5 |
| Severity of defect | ||
| Mild | 2333 | 40 |
| Moderate | 2846 | 49 |
| Severe | 619 | 11 |
| Hospital admissions 2001–2005 | ||
| 0 | 2893 | 50 |
| 1 | 1120 | 19 |
| 2 | 639 | 11 |
| 3 | 406 | 7 |
| 4 | 234 | 4 |
| ≥5 | 506 | 9 |
| Type of admission* | ||
| Cardiovascular | 1953 | 34 |
| Non-cardiovascular | 1674 | 29 |
↵* Subjects may appear in more than one row.