Table 2.
Prevalence and ORs of retinopathy by age of diagnosis of type 2 diabetes and mean A1C category for groups A and B with different durations of diabetes
| Retinopathy (%) in group A: duration of type 2 diabetes 20–30 years (n = 624) |
Retinopathy (%) in group B: duration of type 2 diabetes 10–12 years (n = 852) |
|||||||
|---|---|---|---|---|---|---|---|---|
| Age of diagnosis (years) |
P | Age of diagnosis (years) |
P | |||||
| <45 | 45–55 | >55 | <45 | 45–55 | >55 | |||
| Mean A1C (%) | ||||||||
| <7 | 36.5 | 38.0 | 14.3 | 0.2 | 18.8 | 30.7 | 13.8 | 0.02 |
| OR (95% CI) | 3.5 (0.7–17.1) | 3.7 (0.7–18.3) | 1 | 0.4 (Ptrend) | 1.4 (0.6–3.6) | 2.8 (1.3–5.8) | 1 | <0.0001 (Ptrend) |
| 7–9.0 | 63.1 | 52.3 | 51.2 | 0.1 | 34.4 | 43.4 | 27.3 | 0.02 |
| OR (95% CI) | 10.2 (2.2–47.2) | 6.6 (1.4–3.0) | 6.3 (1.4–31.5) | 0.04 (Ptrend) | 3.3 (1.6–6.6) | 4.8 (2.5–9.1) | 2.4(1.2–4.5) | 0.1 (Ptrend) |
| >9.0 | 73.4 | 55.6 | 30.8 | 0.003 | 55.8 | 52.0 | 36.6 | 0.04 |
| OR (95% CI) | 16.6 (3.5–79.2) | 7.5 (1.5–36.8) | 2.7 (0.4–17.9) | 0.001 (Ptrend) | 7.9 (4.0–15.6) | 6.8 (3.3–13.8) | 3.6 (1.7–7.5) | 0.02 (Ptrend) |
Data are % unless otherwise indicated. P refers to χ2 analysis of retinopathy prevalence across the different age-of-onset subgroups; Ptrend refers to trend analysis of retinopathy prevalence across different age-of-onset subgroups.