Population-based incidence of Type 2 diabetes and its associated risk factors: results from a six-year cohort study in Iran
The Middle East is estimated to have the largest increase in prevalence of diabetes by 2030; yet there is lack of published data on the incidence of Type 2 diabetes in this region. This study aimed to estimate Type 2 diabetes incidence and its associated risk factors in an Iranian urban population.
Methods: Among 3307 non-diabetics [greater than or equal to]20 years (mean age 42+/-13 years, 42% males), glucose tolerance test was performed at baseline in 1999-2001 and at two consecutive phases in 2001-2005 and 2005-2008.
Diabetes and glucose tolerance status were defined according to the ADA 1997 criteria. Logistic regression was used to determine the independent variables associated with incident diabetes and their odds ratios (OR).
Results: After median follow-up of 6 years, 237 new cases of diabetes were ascertained corresponding to an age and sex standardized cumulative incidence of 6.4% (95%CI: 5.6-7.2) and incidence rate of 10.6 (9.2-12.1) per 1000 person years.
Besides classical diabetes risk factors, female sex and low education level significantly increased risk of diabetes in age adjusted models. In full model, the independent predictors were age [OR, 95%CI: 1.2 (1.1-1.3)], family history of diabetes [1.8 (1.3-2.5)], body mass index [greater than or equal to] 30 kg/m2 [2.1 (1.
5-2.9)], abdominal obesity [1.2 (1.1-1.4)], high triglyceride [1.4 (1.1-1.9)], impaired fasting glucose (IFG) [7.0 (4.4-10.9)], and impaired glucose tolerance (IGT)[ 6.0 (4.3-8.3)].
Conclusions: More than 1% of the Iranian urban population older than 20 years develops Type 2 diabetes each year. IFG was the strongest predictor of incident diabetes among the modifiable risk factors.
Author: Hadi HaratiFarzad HadaeghNavid SaadatFereidoun Azizi
Credits/Source: BMC Public Health 2009, 9:186
Published on: 2009-06-16
Copyright by the authors listed above - made available via BioMedCentral (Open Access). Please
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