Research Article 
Risk factors for diabetic retinopathy in a South Indian Type 2 diabetic population—the Chennai Urban Rural Epidemiology Study (CURES) Eye Study 4
R. Pradeepa, B. Anitha, V. Mohan, A. Ganesan and M. Rema
Diabetic Medicine, 2008, 25(5), 536-542. DOI: 10.1111/j.1464-5491.2008.02423.x
Abstract
Aims To determine risk factors for diabetic retinopathy (DR) in an urban South Indian Type 2 diabetic population.
Methods The Chennai Urban Rural Epidemiology Study is a large cross-sectional study conducted in Chennai, South India. A total of 1736 Type 2 diabetic subjects were recruited for this study, which included 1382 known diabetic subjects (90.4% response rate) and 354 randomly selected, newly detected diabetic subjects diagnosed by oral glucose tolerance test. All subjects underwent four-field stereo retinal colour photography, graded by the Early Treatment Diabetic Retinopathy Study protocol.
Results Of the 1736 Type 2 diabetic subjects photographed, photographs could be graded in 1715 subjects. Stepwise ordinal logistic regression analysis revealed that male gender (P=0.041), duration of diabetes (P<0.0001), glycated haemoglobin (HbA1c; P<0.0001), macroalbuminuria (P=0.0002) and insulin therapy (P=0.0001) were significantly associated with severity of DR. The risk for developing DR was 7.7 times (95% confidence interval 4.71–12.48, P<0.0001) for elevated postprandial plasma glucose levels compared with 4.2 times (95% confidence interval 2.78–6.34, P<0.0001) for elevated fasting plasma glucose when the fourth quartile values were compared with the first quartile glucose values.
Conclusions In South Indian Type 2 diabetic subjects, duration of diabetes, HbA1c, male gender, macroalbuminuria and insulin therapy were independent risk factors for severity of DR. Postprandial hyperglycaemia indicated a higher risk for DR compared with elevated fasting plasma glucose levels.
ASCI-ID: 109-122
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