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    Effects of diabetes definition on global surveillance of diabetes prevalence and diagnosis: A pooled analysis of 96 population-based studies with 331 288 participants.
        
        Lancet Diabet. Endocrinol. 3, 624-637 (2015)
    
    
    
				BACKGROUND: Diabetes has been defined on the basis of different biomarkers, including fasting plasma glucose (FPG), 2-h plasma glucose in an oral glucose tolerance test (2hOGTT), and HbA1c. We assessed the effect of different diagnostic definitions on both the population prevalence of diabetes and the classification of previously undiagnosed individuals as having diabetes versus not having diabetes in a pooled analysis of data from population-based health examination surveys in different regions. METHODS: We used data from 96 population-based health examination surveys that had measured at least two of the biomarkers used for defining diabetes. Diabetes was defined using HbA1c (HbA1c ≥6·5% or history of diabetes diagnosis or using insulin or oral hypoglycaemic drugs) compared with either FPG only or FPG-or-2hOGTT definitions (FPG ≥7·0 mmol/L or 2hOGTT ≥11·1 mmol/L or history of diabetes or using insulin or oral hypoglycaemic drugs). We calculated diabetes prevalence, taking into account complex survey design and survey sample weights. We compared the prevalences of diabetes using different definitions graphically and by regression analyses. We calculated sensitivity and specificity of diabetes diagnosis based on HbA1c compared with diagnosis based on glucose among previously undiagnosed individuals (ie, excluding those with history of diabetes or using insulin or oral hypoglycaemic drugs). We calculated sensitivity and specificity in each survey, and then pooled results using a random-effects model. We assessed the sources of heterogeneity of sensitivity by meta-regressions for study characteristics selected a priori. FINDINGS: Population prevalence of diabetes based on FPG-or-2hOGTT was correlated with prevalence based on FPG alone (r=0·98), but was higher by 2-6 percentage points at different prevalence levels. Prevalence based on HbA1c was lower than prevalence based on FPG in 42·8% of age-sex-survey groups and higher in another 41·6%; in the other 15·6%, the two definitions provided similar prevalence estimates. The variation across studies in the relation between glucose-based and HbA1c-based prevalences was partly related to participants' age, followed by natural logarithm of per person gross domestic product, the year of survey, mean BMI, and whether the survey population was national, subnational, or from specific communities. Diabetes defined as HbA1c 6·5% or more had a pooled sensitivity of 52·8% (95% CI 51·3-54·3%) and a pooled specificity of 99·74% (99·71-99·78%) compared with FPG 7·0 mmol/L or more for diagnosing previously undiagnosed participants; sensitivity compared with diabetes defined based on FPG-or-2hOGTT was 30·5% (28·7-32·3%). None of the preselected study-level characteristics explained the heterogeneity in the sensitivity of HbA1c versus FPG. INTERPRETATION: Different biomarkers and definitions for diabetes can provide different estimates of population prevalence of diabetes, and differentially identify people without previous diagnosis as having diabetes. Using an HbA1c-based definition alone in health surveys will not identify a substantial proportion of previously undiagnosed people who would be considered as having diabetes using a glucose-based test. FUNDING: Wellcome Trust, US National Institutes of Health.
			
			
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Times Cited
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        Publikationstyp
        Artikel: Journalartikel
    
 
    
        Dokumenttyp
        Wissenschaftlicher Artikel
    
 
     
    
    
        Schlagwörter
        Fasting Plasma-glucose; Hemoglobin A(1c) Measurement; Glycated Hemoglobin; Cardiovascular-disease; Worldwide Standardization; Consensus Statement; Systematic Analysis; Insulin-resistance; Screening-test; Tolerance Test
    
 
     
    
    
        Sprache
        englisch
    
 
    
        Veröffentlichungsjahr
        2015
    
 
     
    
        HGF-Berichtsjahr
        2015
    
 
    
    
        ISSN (print) / ISBN
        2213-8587
    
 
    
        e-ISSN
        2213-8595
    
 
     
     
     
	     
	 
	 
    
        Zeitschrift
        Lancet Diabetes and Endocrinology
    
 
		
    
        Quellenangaben
        
	    Band: 3,  
	    Heft: 8,  
	    Seiten: 624-637 
	    
	    
	
    
 
  
         
        
            Verlag
            Elsevier
        
 
        
            Verlagsort
            New York
        
 
	
         
         
         
         
         
	
         
         
         
    
         
         
         
         
         
         
         
    
        Begutachtungsstatus
        Peer reviewed
    
 
    
        Institut(e)
        Institute of Genetic Epidemiology (IGE)
Institute of Epidemiology (EPI)
 
    Institute of Epidemiology (EPI)
        POF Topic(s)
        30501 - Systemic Analysis of Genetic and Environmental Factors that Impact Health
30202 - Environmental Health
 
    30202 - Environmental Health
        Forschungsfeld(er)
        Genetics and Epidemiology
    
 
    
        PSP-Element(e)
        G-504100-001
G-504000-006
 
     
     	
    G-504000-006
        PubMed ID
        26109024
    
    
    
        WOS ID
        WOS:000358540100018
    
    
        Scopus ID
        84938199196
    
    
        Erfassungsdatum
        2015-07-30