Table 1.
Leisure-time physical activity levels expressed as mean MET hours/day at the mean ages of 24.2 years (the FT12 study) and 24.5 years (the FT16 study). The MET values are presented according to the childhood motor developmental differences (more advanced co-twins vs. less advanced co-twins). Only the healthy MZ and same-sexed DZ twin pairs were included in the analyses. It is important to note that the assessments of leisure-time physical activity behavior in the FT12 and FT16 studies were carried out at different times and that the response options for the frequency of leisure-time physical activity were slightly different in the FT12 and FT16 studies.
| Motor skill development in infancy and childhood | Mean MET index (MET hours/day)±SD | |
|---|---|---|
| FT12 | FT16 | |
| Turning over from back to stomach | (N=68 pairs) | (N=309 pairs) |
| More advanced co-twin | 8.20±9.38 | 5.73±5.45 |
| Less advanced co-twin | 6.59±6.86 | 5.11±4.68 |
| Standing unaided | (N=81 pairs) | (N=340 pairs) |
| More advanced co-twin | 9.68±6.22 | 6.12±5.70 |
| Less advanced co-twin | 7.84±5.42 | 5.06±4.62 |
| Walking unaided | (N=186 pairs) | (N=563 pairs) |
| More advanced co-twin | 7.64±9.27 | 5.53±5.10 |
| Less advanced co-twin | 6.26±7.53 | 5.30±4.82 |
| Climbing stairs unaided | (N=38 pairs) | (N=179 pairs) |
| More advanced co-twin | 8.87±8.32 | 5.90±5.90 |
| Less advanced co-twin | 7.30±8.88 | 5.00±4.63 |
| Fundamental motor skills at age 6 | (N=153 pairs) | (N=314 pairs) |
| More advanced co-twin | 8.53±10.40 | 5.63±5.15 |
| Less advanced co-twin | 7.16±8.76 | 4.78±4.40 |
| Agility at age 10 (FT12)/at age 12 (FT16) | (N=179 pairs) | (N=449 pairs) |
| More advanced co-twin | 7.52±8.85 | 5.54±5.16 |
| Less advanced co-twin | 6.27±7.11 | 4.86±4.58 |
| Strength at age 10 (FT12)/at age 12 (FT16) | (N=186 pairs) | (N=443 pairs) |
| More advanced co-twin | 6.98±6.85 | 5.45±5.08 |
| Less advanced co-twin | 6.32±6.76 | 5.15±4.69 |
MET=metabolic equivalent, SD=standard deviation