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Table 2 Association of BMI z-score calculated according to WHO and CDC criteria with metabolic syndrome and insulin resistance (based on receiver operating characteristic (ROC) and logistic regression analysis)

From: Comparison between CDC and WHO BMI z-score and their relation with metabolic risk markers in Northern Portuguese obese adolescents

  ROC Logistic Regression 1)
  WHO CDC  
  AUC expB (95% CI)
Metabolic syndrome    
Total population (n = 246; MS = 61) 0.680** 0.703** CDC 15.66** (5.16-47.59)
Male Age group 1 (n = 57; MS = 9) 0.508 0.543 CDC 17.55** (3.90-79.06); Age* 3.65 (1.14-11.70)
Male Age group 2 (n = 67; MS = 27) 0.763** 0.788**
Female Age group 1 (n = 39; MS = 12) 0.642 0.636 WHO 2.76* (1.36-5.60); Age* 0.39 (0.15-0.99)
Female Age group 2 (n = 83; MS = 13) 0.693* 0.664
Insulin resistance    
Total population (n = 246; IR = 190) 0.655** 0.680** CDC 10.86** (3.64-32.46)
Male Age group 1 (n = 57; IR = 39) 0.551 0.582 CDC 8.18* (1.97-33.96)
Male Age group 2 (n = 67; IR = 53) 0.720* 0.739*
Female Age group 1 (n = 39; IR = 32) 0.777** 0.777** CDC 21.77** (3.76-126.02)
Female Age group 2 (n = 83; IR = 66) 0.696* 0.689*
  1. *, P < 0.05; **, P < 0.001; 1)adjusted for age groups; insulin resistance defined as HOMA-IR ≥ 2.5; metabolic syndrome defined according to the International Diabetes Federation; age group 1: males <13 years and females <12 years; age group 2: males ≥ 13 years, females ≥ 12 years; AUC, area under the curve; CDC, Center for Disease Control and Prevention; CI, confidence interval; IR, insulin resistance; ROC, Receiver operating characteristic; MS, metabolic syndrome; WHO, World Health Organization.