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In 1997 the American Diabetes Association changed the diagnostic
fasting plasma value for glucose from 7.8 to 7.0 mmol/l. For screening
and epidemiological studies they no longer recommended the standard
75 g oral glucose tolerance test recommended by the WHO. The DECODE
Study Group's reanalysis of epidemiological studies in eight European
countries
more than 26 000 patients
found that the two diagnostic
criteria agreed in only 431 of 1517 people classified as diabetic (p
371). Because of this reclassification the group says that the WHO
should wait for results of further reanalyses, with focus on prognostic
impact, before it considers adopting the ADA criteria.