Cross tabulation of data from 115 choroideraemia patients at their most recent visit by age subgroup and VA range
| <20 years | 20–39 years | 40–59 years | ≥60 years | Total | |
|---|---|---|---|---|---|
| 20/40 or better | 17/18 | 39/42 | 31/43 | 4/12 | 91/115 (79%) |
| >20/40 to ≤20/70 | 1/18 | 1/42 | 7/43 | 4/12 | 13/115 (11%) |
| >20/70 to <20/200 | 0/18 | 0/42 | 3/43 | 0/12 | 3/115 (3%) |
| 20/200 or worse | 0/18 | 2/42 | 2/43 | 4/12 | 8/115 (7%) |