Subject characteristics of the original cohort (n = 488 eyes of 480 subjects) and 2 year follow up subgroup (n = 98 eyes of 97 subjects) demonstrate that the subgroup is representative of the original cohort
| Original cohort | Subgroup | p Value | ||
|---|---|---|---|---|
| NS = not significant. | ||||
| Age (years) | ||||
| mean (SD) | 74.9 (9.6) | 76.3 (9.9) | NS | |
| range | 34.7–94.3 | 47.1–96.7 | ||
| Sex (female) | 62% | 66% | NS | |
| Right eye | n = 242 (49.6%) | n = 47 (48.0%) | NS | |
| Left eye | n = 246 (50.4%) | n = 51 (52.0%) | NS | |
| Ethnic origin | ||||
| European | n = 346 (72%) | n = 76 (78.4%) | NS | |
| Pacific Island | n = 48 (10%) | n = 8 (8.2%) | ||
| Maori | n = 38 (8%) | n = 6 (6.2%) | ||
| Asian | n = 33 (7%) | n = 3 (3.1%) | ||
| Other | n = 15 (3%) | n = 4 (4.1%) | ||