Table 1.
Descriptive statistics for the three samples used in the analysis.
| Sample | Variable | Min | Med | Mean | Max | SD |
|---|---|---|---|---|---|---|
| Longitudinal (NL=77, 13 sites) | Duration | 0.00 | 1.03 | 1.05 | 2.72 | 0.85 |
| Entry age | 26.15 | 42.21 | 42.91 | 75.85 | 9.20 | |
| CAG | 16.00 | 41.50 | 36.86 | 47.00 | 10.20 | |
| Education | 8.00 | 16.00 | 15.08 | 20.00 | 2.72 | |
| Sex | 0.55 | |||||
| Cross-sectional (NC=80, 5 sites) | Duration | 0.00 | 2.95 | 2.73 | 4.26 | 1.06 |
| Entry age | 19.15 | 41.73 | 41.83 | 62.59 | 8.39 | |
| CAG | 17.00 | 42.00 | 36.83 | 46.00 | 10.11 | |
| Education | 8.00 | 15.00 | 14.74 | 20.00 | 2.75 | |
| Sex | 0.50 | |||||
| Overlapping (NO=18, 4 sites) | Duration | 1.91 | 1.99 | 2.05 | 2.36 | 0.13 |
| Entry age | 26.84 | 39.02 | 39.10 | 61.17 | 8.42 | |
| CAG | 17.00 | 42.00 | 35.00 | 46.00 | 12.10 | |
| Education | 11.00 | 16.00 | 15.32 | 20.00 | 2.52 | |
| Sex | 0.53 |
Note. Duration=current age-age at entry; sex = proportion of males.