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Lipoprotein(a) as an independent risk factor for diabetic retinopathy in male patients in non-insulin-dependent diabetes mellitus.

Relationship of the lipoprotein(a) [Lp(a)] concentration as a risk factor independent of other factors with the severity of diabetic retinopathy were evaluated by multiple regression analysis. The subjects were 158 patients with non-insulin-dependent diabetes mellitus (NIDDM). Multiple regression analysis was carried with the severity of diabetic retinopathy as the dependent variable and 13 independent variables, namely the Lp(a) concentration, sex, age, body mass index, duration of diabetes, ischemic heart disease, fasting plasma glucose, glycosylated hemoglobin A1c, total cholesterol, triglyceride, high-density lipoprotein cholesterol, anti-diabetic treatments, and diabetic nephropathy. The analysis was performed separately in all subjects, males only, and females only. The standard partial regression coefficient of Lp(a) was significant (0.293, p < 0.01), and the multiple correlation coefficient was 0.611 in the males. However, the standard partial correlation coefficient of Lp(a) was not significant in all patients and in females only. The rank of contribution of Lp(a) to retinopathy was the third in males, following triglyceride and nephropathy and followed by anti-diabetic treatments. These results suggest that Lp(a) might be an independent risk factor for diabetic retinopathy in male patients with NIDDM.