Table 1 Descriptive characteristics for longitudinal twin samples from LSADT
| Â | MZ twins | DZ twins | All | ||||
|---|---|---|---|---|---|---|---|
Male | Female | Total | Male | Female | Total | ||
n, pair | 6 | 10 | 16 | 5 | 20 | 25 | 41 |
Age, 1997 | |||||||
 Mean | 76.97 | 76.13 | 76.45 | 76.79 | 76.05 | 76.19 | 76.29 |
 Median | 76.67 | 75.61 | 76.31 | 75.85 | 75.68 | 75.71 | 75.79 |
 Min | 75.21 | 73.21 | 73.21 | 74.66 | 74.05 | 74.05 | 73.21 |
 Max | 79.51 | 81.75 | 81.75 | 79.32 | 79.59 | 79.59 | 81.75 |
Age, 2007 | |||||||
 Mean | 86.82 | 86.04 | 86.33 | 86.55 | 85.86 | 86.00 | 86.13 |
 Median | 86.27 | 85.25 | 85.97 | 85.95 | 85.60 | 85.68 | 85.73 |
 Min | 85.23 | 83.30 | 83.30 | 84.13 | 84.00 | 84.00 | 83.30 |
 Max | 89.53 | 91.70 | 91.70 | 89.13 | 89.49 | 89.49 | 91.70 |