Table 3.
Prevalence and grade of diabetic retinopathy and maculopathy in relation to duration of diabetes and random blood glucose. Individuals were classified by the eye with more advanced disease
| Retinopathy | Maculopathy | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | BDR n | (%) | PPDR n | (%) | PDR n | (%) | P‐value | Total | NRM n | (%) | RM n | (%) | P‐value | |
| Duration of DM (years) | ||||||||||||||
| 0–5 | 1365 | 129 | (9.5) | 43 | (3.2) | 20 | (1.5) | 1351 | 32 | (2.4) | 64 | (4.8) | ||
| 6–10 | 913 | 184 | (20.2) | 50 | (5.5) | 22 | (2.4) | 905 | 48 | (5.3) | 102 | (11.3) | ||
| 11–15 | 466 | 127 | (27.3) | 40 | (8.6) | 26 | (5.6) | 463 | 28 | (6.1) | 88 | (19.0) | ||
| 16–20 | 206 | 77 | (37.4) | 31 | (15.1) | 9 | (4.4) | 205 | 18 | (8.8) | 60 | (29.3) | ||
| >20 | 176 | 71 | (40.3) | 26 | (14.8) | 13 | (7.4) | <0.0001 | 173 | 15 | (8.7) | 43 | (24.9) | <0.0001 |
| Total | 3126 | 3097 | ||||||||||||
| Random blood sugar | ||||||||||||||
| <11 | 1658 | 280 | (16.9) | 97 | (5.9) | 29 | (1.8) | 1312 | 69 | (4.2) | 152 | (9.3) | ||
| ≥11 | 1325 | 292 | (22.0) | 82 | (6.2) | 53 | (4.0) | <0.0001 | 1644 | 67 | (5.1) | 185 | (14.1) | <0.0001 |
| Total | 2983 | 2956 | ||||||||||||
DM, diabetes mellitus; BDR, background diabetic retinopathy; PPDR, pre‐proliferative diabetic retinopathy; PDR, proliferative retinopathy. NRM, non‐referable maculopathy; RM, referable maculopathy. P‐values were calculated by chi‐squared test to assess the effect of increasing duration of DM and random blood sugar on the stage of retinopathy and maculopathy.