Validity of triglyceride–glucose index as an indicator for metabolic syndrome in children and adolescents: the CASPIAN-V study

Purpose The purpose of this study was to determine the cut-off values of triglycerides and glucose (TyG) index as one of the indirect indices for metabolic syndrome (MetS) in a pediatric population. Methods This national study was conducted in 2015 on 14400 students, aged 7–18 years. They were selected by random cluster sampling from 30 provinces of our country during the fifth survey of a national school-based surveillance program. MetS was defined based on the Adult Treatment Panel III (ATP III) criteria modified for the pediatric age group. The cut-off values of TyG index for MetS were obtained using the receiver operation characteristic (ROC) curve analysis by gender and age groups. Results Totally, 3843 students (52.3% boys) with mean (SD) age of 12.45 (3.04) years were assessed. The area under the ROC curve of TyG index for MetS was 0.83 in total participants. According to the ATP III criteria the cut-off values of the TyG index were 8.33 (8.21–8.45) in total students, 8.47 (8.36–8.58) in boys, and 8.33 (8.18–8.48) in girls. In the 7–12 and 13–18 years’ age groups, these values were 8.47 (8.32–8.63) and 8.34 (8.22–8.45) in total, 8.39 (8.26–8.52) and 8.47 (8.33–8.61) in boys, 8.33 (8.11–8.55) and 8.35 (8.22–8.47) in girls, respectively. Conclusion The findings of this study can be clinically helpful for screening MetS in children and adolescents but the effectiveness of these criteria needs to be evaluated by further longitudinal surveys. Level of evidence Level V, cross-sectional descriptive study (National surveillance study).