Echocardiography: Total AV-valve plane displacement determined by "M-mode" in three positions, M2, M3 and M4.
| M-mode | |||
| Person No. | M2 | M3 | M4 |
| 1 | 14 | 16 | 24 |
| 2 | 14 | 15 | 28 |
| 3 | 15 | 16 | 28 |
| 4 | 14 | 14 | 26 |
| 5 | 16 | 14 | 23 |
| 6 | 13 | 15 | 23 |
| 7 | 15 | 13 | 26 |
| 8 | 14 | 14 | 22 |
| 9 | 14 | 13 | 24 |
| m | 14.3 | 14.4 | 24.9 |
| +/- I | 0.7 | 0.9 | 1.8 |