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)
PAge of diagnosis (years)
P
<4545–55>55<4545–55>55
Mean A1C (%)
    <736.538.014.30.218.830.713.80.02
        OR (95% CI)3.5 (0.7–17.1)3.7 (0.7–18.3)10.4 (Ptrend)1.4 (0.6–3.6)2.8 (1.3–5.8)1<0.0001 (Ptrend)
    7–9.063.152.351.20.134.443.427.30.02
        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)
     >9.073.455.630.80.00355.852.036.60.04
        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.