Table 6A.
Time of first test | Duration between tests | |||
---|---|---|---|---|
2–3 months | 5–6 months | 8–9 months | 11 months | |
1 month | 23 | 19 | 25 | 20 |
3 months | 8 | 11 | 12 | |
6 months | 9 | 7 | ||
9 months | 5 |
Time of first test | Duration between tests | |||
---|---|---|---|---|
2–3 months | 5–6 months | 8–9 months | 11 months | |
1 month | 23 | 19 | 25 | 20 |
3 months | 8 | 11 | 12 | |
6 months | 9 | 7 | ||
9 months | 5 |