Higher FPG concentrations within the normal range were an independent risk factor for type 2 diabetes. A group of researchers led by Dr Diane Becker of the Johns Hopkins Medical Institutions in Baltimore, USA, evaluated the risk of developing diabetes in members of high-risk families with fasting plasma glucose (FPG) concentrations within the normal range. A total of 542 non-diabetic adults aged 30-59 with siblings with documented premature coronary disease were followed prospectively to determine the incidence of type 2 diabetes. The mean follow-up was 8.7 years.
The researchers found that 45 patients (7.8%) developed type 2 diabetes during the follow-up period. The incidence of diabetes increased with increasing thresholds of FPG 90-120mg/dL (5.0, – 6.7mmol/L). All FPG thresholds within the normal range 90-100mg/dL.(5.0 and 5.6mmol/L) had diagnostic efficiency levels >0.74, and maximal diagnostic efficiency for FPG was achieved at 99mg/dL.(5.50mmol/L).
The researchers concluded that higher FPG concentrations within the normal range were an independent risk factor for type 2 diabetes in high-risk adults, and may help identify candidates for primary preventive interventions.
Diabetes Research and Clinical Practice 2006;74:267-73
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