Table 1 Number of follow-up contacts at each end-point in the six age ranges
Age range (years) | Number of follow-up contacts | ||||
|---|---|---|---|---|---|
| Â | 1 mo. | 3 mo. | 12 mo. | 24 mo. | 30 mo. |
18 ~ 29 | 9 | 9 | 9 | 7 | 2 |
30 ~ 39 | 15 | 15 | 15 | 12 | - |
40 ~ 49 | 23 | 23 | 23 | 15 | 3 |
50 ~ 59 | 19 | 19 | 19 | 15 | 4 |
60 ~ 69 | 21 | 21 | 21 | 18 | 4 |
70 ~ 80 | 13 | 13 | 13 | 11 | 4 |