Diabetes Care, Vol 17, Issue 10 1172-1177, Copyright © 1994 by American Diabetes Association

ARTICLES

Risk factors for distal symmetric neuropathy in NIDDM. The San Luis Valley Diabetes Study

GM Franklin, SM Shetterly, JA Cohen, J Baxter and RF Hamman
Department of Environmental Health, University of Washington School of Public Health and Community Medicine, Seattle 98103.

OBJECTIVE--To investigate risk factors for distal symmetric (sensory) neuropathy among prevalent cases of non-insulin-dependent diabetes mellitus (NIDDM) in a population-based study in southern Colorado. RESEARCH DESIGN AND METHODS--Prevalent neuropathy was identified in 77 of 277 people with NIDDM by a standardized history and neurologic examination. Fifteen known or suspected risk factors for neuropathy were determined without knowledge of neuropathy status. RESULTS--Older age at examination, longer duration of diabetes, higher glycohemoglobin percentage, lower fasting C-peptide, insulin use, and presence of retinopathy and nephropathy (microalbumin > or = 200 micrograms/ml) were all significantly associated with neuropathy. Sex, ethnicity (Hispanic versus non-Hispanic white), height, systolic blood pressure, peripheral vascular disease, cigarette and alcohol use, and serum lipid levels were not significantly associated with neuropathy. In a multivariate logistic model, increasing age (odds ratio [OR] = 1.3, 95% confidence interval [CI] = 1.1-1.6), longer duration of diabetes (OR = 1.3, CI = 1.0-1.6), increased glycohemoglobin percentage (OR = 1.5, CI = 1.1-2.1), and insulin use (OR = 2.8, CI = 1.3-6.1) were associated with neuropathy. Retinopathy (OR = 3.0, CI = 1.2-7.7), but not nephropathy, was important when added to this model. CONCLUSIONS--Worse glycemic control and insulin use were independently associated with neuropathy in people with NIDDM. Whether insulin use represents another marker for severity of the metabolic disturbance or is an independent risk factor for neuropathy requires further study. We could not confirm associations of neuropathy with height, with nephropathy, or with retinopathy, independent of duration of diabetes.
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