GPT and metabolic syndrome: However, the NCEP-ATP III and IDF definitions have been found to show good agreement in the diagnosis of MetS.[42], [43] Additionally, BMI has been suggested as equally effective as waist circumference for predicting the development of metabolic disorders[44], [45] and has been adopted in previous studies of the MetS.[1], [46] We were also unable to correct the estimates for within-individual variation in levels of ALT over time which may have underestimated the associations, because data involving repeat measurements were not reported by the contributing studies.