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Table 4 Discriminatory ability of each self-reported silhouette ranking in detecting obesity by sex (Seychelles, 2013, N = 1240)

From: Validity of silhouette showcards as a measure of body size and obesity in a population in the African region: A practical research tool for general-purpose surveys

  Men Women
Cut off Sensivity (%) Specificity PPV (%) NPV (%) Sensivity (%) Specificity PPV (%) NPV (%)
(=1) 100 0.0 21.0 100 100 0.0 41.1 100
(=2) 100 1.9 21.3 100 100 0.5 41.1 100
(=3) 100 18.4 24.6 100 100 6.9 42.7 100
(=4) 100 45.1 32.6 100 99.3 25.7 48.1 98.5
(=5) 92.0 79.7 54.6 97.4 96.5 56.1 60.4 95.9
(=6) 46.4 97.1 81.2 87.2 80.9 84.1 77.9 86.4
(=7) 18.8 99.8 95.4 82.2 43.4 98.3 94.8 71.4
(=8) 4.5 100 100 79.7 17.4 99.1 92.7 63.3
(=9) 1.8 100 100 79.3 7.3 100 100 60.8
  1. Note: Sensitivity, Specificity, Positive Predictive Value (PPV), and Negative Predictive Value (NPV) of each silhouette ranking in detecting obesity (BMI of 30 or higher) in men and women