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| Control group (n = 23) | Group 1 (n = 22) | Group 2 (n = 21) | Group 3 (n = 23) | |
| Mean age (range), y | 67.7 (51 – 83) | 76.3 (61 – 87) | 71.8 (36 – 87) | 70.1 (58 – 83) |
| Male-to-female ratio | 18:5 | 14:8 | 16:5 | 15:8 |
