title: Predictors of glycemic control in Japanese subjects with type 2 diabetes mellitus.
abstract: The purpose of this study was to investigate which pathophysiological and demographic characteristics of Japanese subjects with type 2 diabetes mellitus were associated with poor glycemic control and to propose a statistical model for predicting their glycemic control. A total of 220 subjects with type 2 diabetes mellitus were enrolled in this study. Frequently sampled intravenous glucose tolerance test was performed to determine the first-phase C-peptide secretion rate (CS1) and insulin sensitivity index. Multiple regression analysis in a stepwise manner was carried out to identify independent regulators of glycemic control. Upon stepwise linear regression analysis with hemoglobin A1c as a dependent parameter, fasting plasma glucose concentration (FPG), CS1, and onset age remained as predictors, explaining 41.0% of glycemic control. The young-onset group (onset age < or =48 years) had significantly higher hemoglobin A1c than the old-onset group (onset age >48 years) (P = .0148), although the present age was significantly older in the old-onset group; and there were no significant differences in duration of diabetes, treatment, body mass index, FPG, fasting insulin level, homeostasis model assessment of insulin resistance, CS1, and log(insulin sensitivity index) between them. Worsening factors of glycemic control in Japanese subjects with type 2 diabetes mellitus were elevated FPG, impaired first-phase insulin secretion, and young age of onset of the disease. Because glycemic control in the subjects with young-onset diabetes tends to be worse, early and aggressive intervention should be required for those with young-onset diabetes to prevent long-term complications.
authors.affiliation: Diabetes Center, Chiba Central Medical Center, Chiba 246-0017, Japan. yt4486yt@yahoo.co.jp <yt4486yt@yahoo.co.jp>
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Tokuyama
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Ishizuka
authors.forename: Kana
authors.initials: K
authors.lastname: Matsui
authors.forename: Toru
authors.initials: T
authors.lastname: Egashira
authors.forename: Azuma
authors.initials: A
authors.lastname: Kanatsuka
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001786:Blood Glucose / Q000032:analysis*; D015992:Body Mass Index; D003924:Diabetes Mellitus, Type 2 / Q000097:blood / Q000628:therapy*; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis*; D006801:Humans; D007333:Insulin Resistance; D008297:Male; D008875:Middle Aged; D012044:Regression Analysis
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin; C517652:hemoglobin A1c protein, human