title: Potential impact of a change in the diagnostic criteria for diabetes mellitus on the prevalence of abnormal glucose tolerance in a local community at risk of diabetes: impact of new diagnostic criteria for diabetes mellitus.
abstract: OBJECTIVE
  To compare the prevalence of diabetes and abnormal glucose metabolism using conventional and suggested new WHO and new ADA criteria in a group of people with symptoms of diabetes.
  
  
  METHODS
  We examined retrospectively the results of 154 consecutive OGTTs in such patients performed using capillary whole blood.
  
  
  RESULTS
  With the 1985 WHO criteria. Forty-four point eight per cent of subjects (69 subjects, with 95% confidence intervals, 37-52.6%) had diabetes, 47.8% (33 subjects, 36-59.6%) had a normal fasting glucose, 31.2% (48 subjects, 23.9-38.5%) had impaired glucose tolerance (IGT) and 76% (117 subjects, 69.3-82.7%) had abnormal glucose tolerance. Applying the ADA criteria (fasting capillary whole blood only), 33.1% (51 subjects, 25.7-40.5%) had diabetes (a 26% relative reduction) and 11% (17 subjects, 6.1-15.9%) IFG, with 44.1% (68 subjects, 36.3-51.9%) having abnormal glucose metabolism (a 42% relative reduction). If the proposed 1998 WHO criteria were used, the number with diabetes increase to 48% (74 subjects, 40.1-55.9%) a 7.2% increase on the old criteria. 27.9% (43 subjects, 20.8-35%) had IGT, so the number with some degree of abnormal glucose metabolism remains unchanged. Use of the ADA criteria, considering only the fasting glucose as suggested, will result in a significant reduction in the diagnosis of diabetes and those with abnormal glucose metabolism.
authors.affiliation: Department of Diabetes and Endocrinology, Leicester Royal Infirmary, UK.
authors.forename: M J
authors.initials: MJ
authors.lastname: Davies
authors.forename: S
authors.initials: S
authors.lastname: Muehlbayer
authors.forename: P
authors.initials: P
authors.lastname: Garrick
authors.forename: P G
authors.initials: PG
authors.lastname: McNally
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001208:Asia / Q000208:ethnology; D016009:Chi-Square Distribution; D003153:Community Health Services; D003920:Diabetes Mellitus / Q000175:diagnosis* / Q000453:epidemiology; D018149:Glucose Intolerance / Q000175:diagnosis* / Q000453:epidemiology; D005951:Glucose Tolerance Test; D006801:Humans; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors; D006113:United Kingdom / Q000453:epidemiology; D014944:World Health Organization