Table 1.
Descriptive statistics for each age interval
| Age interval | N | Twin pairs MZ/DZ | Mean age (SD) | Mean spatial (SD) | Mean speed (SD) | Mean FEV1 (SD) |
|---|---|---|---|---|---|---|
| 50 | 89 | 14/26 | 51.4 (1.5) | 58.1 (10.1) | 58.5 (8.6) | 2.7 (0.7) |
| 53 | 165 | 27/49 | 54.5 (0.9) | 56.9 (9.5) | 58.2 (8.2) | 2.6 (0.7) |
| 56 | 200 | 35/50 | 57.6 (0.9) | 57.3 (9.9) | 57.8 (8.2) | 2.6 (0.7) |
| 59 | 233 | 38/64 | 60.5 (0.9) | 56.3 (10.3) | 56.9 (9.5) | 2.5 (0.7) |
| 62 | 299 | 52/73 | 63.4 (0.9) | 53.9 (10.2) | 54.2 (9.3) | 2.3 (0.7) |
| 65 | 346 | 55/89 | 66.4 (0.8) | 52.6 (9.9) | 51.6 (9.4) | 2.3 (0.7) |
| 68 | 329 | 44/77 | 69.4 (0.8) | 50.5 (10.3) | 49.4 (9.1) | 2.1 (0.7) |
| 71 | 303 | 39/72 | 72.5 (0.9) | 48.7 (9.3) | 48.3 (8.6) | 2.0 (0.6) |
| 74 | 251 | 29/58 | 75.6 (0.8) | 47.8 (9.0) | 46.5 (8.9) | 1.9 (0.6) |
| 77 | 186 | 31/29 | 78.5 (0.9) | 45.6 (9.8) | 44.3 (9.6) | 1.8 (0.6) |
| 80 | 127 | 26/17 | 81.6 (0.9) | 45.3 (9.0) | 42.1 (9.8) | 1.7 (0.6) |
| 83 | 59 | 5/3 | 84.5 (0.9) | 42.7 (6.9) | 39.5 (8.4) | 1.5 (0.6) |
| 86 | 26 | 1/2 | 87.3 (0.9) | 40.6 (7.6) | 36.1 (7.3) | 1.4 (0.5) |
Age interval “50” includes ages 50–52.9