Table 1.
Sample Characteristics
| Wave | N | N pairs | Age | Flexibility | Fine motor | Balance |
|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |||
| IPT1: men | 247 | 22/24/32/41 | 65.1 (7.7) | 2.0 (0.2) | 8.6 (1.4) | 10.6 (1.9) |
| IPT1: women | 396 | 26/40/70/50 | 65.9 (8.9) | 2.0 (0.2) | 8.7 (1.5) | 11.0 (2.3) |
| IPT2: men | 247 | 16/26/31/37 | 65.0 (8.5) | 2.1 (0.4) | 8.5 (1.3) | 10.4 (1.4) |
| IPT2: women | 346 | 17/31/63/42 | 66.7 (9.3) | 2.2 (0.6) | 8.6 (1.2) | 10.9 (2.7) |
| IPT3: men | 234 | 15/19/30/38 | 67.2 (8.4) | 2.2 (0.4) | 8.6 (1.4) | 10.8 (1.5) |
| IPT3: women | 335 | 15/33/57/36 | 69.9 (9.5) | 2.3 (0.6) | 8.7 (1.2) | 11.1 (2.5) |
| IPT5: men | 213 | 10/21/27/27 | 68.9 (9.2) | 2.2 (0.6) | 8.8 (1.9) | 11.3 (3.1) |
| IPT5: women | 328 | 19/28/50/25 | 71.7 (10.3) | 2.4 (0.9) | 9.2 (2.8) | 12.0 (4.1) |
| IPT6: men | 181 | 10/15/20/20 | 71.0 (8.9) | 2.2 (0.5) | 9.1 (1.5) | 11.5 (3.1) |
| IPT6: women | 264 | 15/20/37/21 | 73.0 (9.5) | 2.4 (0.8) | 9.5 (2.6) | 11.9 (3.4) |
| IPT7: men | 155 | 8/13/15/19 | 73.1 (8.7) | 2.4 (0.8) | 9.8 (3.3) | 12.1 (4.2) |
| IPT7: women | 222 | 10/17/28/18 | 75.2 (9.0) | 2.5 (0.9) | 9.8 (3.4) | 12.5 (4.2) |
Notes. IPT = in-person testing. N pairs indicates number of monozygotic reared apart/monozygotic reared together/dizygotic reared apart/dizygotic reared together twin pairs.