Percentage of original study participants still present, dropped out, or dead at each three-month follow up
| Follow up (months) | 3 | 6 | 9 | 12 | 15 | 18 | 21 | 24 | 28 | 32 |
|---|---|---|---|---|---|---|---|---|---|---|
| Still present (%) | 95 | 91 | 89 | 86 | 83 | 81 | 79 | 76 | 74 | 70 |
| Dropped out or absent (%) | 5 | 7 | 9 | 11 | 13 | 14 | 15 | 16 | 18 | 21 |
| Dead (%) | 1 | 2 | 2 | 3 | 4 | 5 | 6 | 8 | 9 | 9 |