The presence and detection ages of AVBs
| Highest AVB detected | Frequency | Per cent | Mean age, years (n) | Min age | Max age | SD |
| 1st degree | 17 | 28.3 | 44.4 (n=26)* | 21.4 | 65.5 | 11.0 |
| 2nd degree | 14 | 23.3 | 45.7 (n=15)* | 30.5 | 65.6 | 10.7 |
| Mobitz 1 | 10 | |||||
| Mobitz 2 | 3 | |||||
| Both | 1 | |||||
| 3rd degree | 5 | 8.3 | 49.1 (n=5) | 41.2 | 61.6 | 8.3 |
| Any AVB | 36 | 60.0 | 44.0 (n=36) | 21.4 | 65.5 | 10.6 |
| No AVB | 24 | 40.0 | 39.7† (n=24) | 20.7 | 70.5 | 15.0 |
*Includes individuals with an initial lower level AVB followed by a higher-level block.
†At last follow-up.
AVB, atrioventricular block.