Younger-onset versus older-onset type 2 diabetes: Clinical profile and complications.

Aims: To compare the clinical profile and complications between younger and older onset type 2 diabetes (T2DM) patients at a tertiary care diabetes center in south India.

Methods: We compared individuals with T2DM detected at age ≤25years (n=267) and at age≥50years (n=267), matched for gender and duration of diabetes. We reviewed electronic patient charts and extracted data on biochemical parameters (plasma glucose, serum lipids and glycated hemoglobin). We estimated prevalence of complications (retinopathy, nephropathy, neuropathy, and peripheral vascular disease). We examined odds of having each complication, after adjusting for clinical differences between younger- and older-onset T2DM.

Results: Individuals with younger-onset T2DM had significantly greater glycated hemoglobin (8.7 vs. 7.5%), serum cholesterol (160 vs. 148mg/dl), serum triglycerides (147 vs. 128mg/dl), LDL cholesterol (92 vs. 82mg/dl) and lower HDL cholesterol levels (39 vs. 42mg/dl). However, waist circumference (90.4 vs. 92.6cm) and systolic blood pressure (125 vs. 133mmHg) were significantly higher in older onset T2DM. Prevalence of retinopathy (47.6 vs. 31.0%) was higher in younger onset T2DM while neuropathy (41.8 vs. 9.2%) and peripheral vascular disease (6.2 vs. 1.2%) were higher in older onset T2DM. In multiple logistic regression analysis, after adjusting for glycated hemoglobin, hypertension, and hypercholesterolemia, younger onset T2DM had a higher odds of developing retinopathy [Odds Ratio: 2.19; Confidence Intervals: 1.42-3.38] when compared to older onset T2DM.

Conclusions: Younger onset T2DM patients have worse glycemic and lipid control, and higher prevalence of retinopathy compared to older onset T2DM patients. This underscores the need for more aggressive metabolic control in young-onset T2DM.