Table 1. Subjects enrolled, examined, and lost to follow-up by baseline age.
| Baseline age (years) | Number (%) enrolled at baseline |
Number (%) examined | Number (%) lost to follow-up |
Examination follow-up percentage | |
| Baseline | Follow-up | ||||
| 6 | 300 (8.65) | 239 (7.79) | 178 (9.52) | 61 (5.08) | 74.48 |
| 7 | 362 (10.44) | 313 (10.20) | 221 (11.82) | 92 (7.66) | 70.61 |
| 8 | 369 (10.64) | 339 (11.04) | 240 (12.84) | 99 (8.24) | 70.80 |
| 9 | 378 (10.90) | 350 (11.40) | 239 (12.79) | 111 (9.24) | 68.29 |
| 10 | 373 (10.75) | 341 (11.12) | 227 (12.15) | 114 (9.49) | 66.57 |
| 11 | 349 (10.06) | 319 (10.39) | 216 (11.56) | 103 (8.58) | 67.71 |
| 12 | 358 (10.32) | 305 (9.93) | 168 (8.99) | 137 (11.41) | 55.08 |
| 13 | 325 (9.37) | 285 (9.28) | 136 (7.28) | 149 (12.41) | 47.72 |
| 14 | 379 (10.93) | 354 (11.53) | 152 (8.13) | 202 (16.82) | 42.94 |
| 15 | 276 (7.96) | 225 (7.33) | 92 (4.92) | 133 (11.07) | 40.89 |
| All | 3469 (100) | 3070 (100) | 1869 (100) | 1201 (100) | 60.88 |