Table 3 Incidence of sight-threatening cataract among the study and control groups
Events | Non-DM control n = 13,188 | DM control n = 13,188 | DR n = 3297 |
|---|---|---|---|
Follow up person months | 680,920 | 656,839 | 142,148 |
New cataract case | 957 | 1108 | 919 |
Incidence ratea (95% CI) | 1.41 (1.32–1.50) | 1.69 (1.59–1.79) | 6.47 (6.06–6.90) |
Crude relative risk (95% CI) | Reference | 1.20 (1.10–1.31)b | 4.62 (4.22–5.06)b |