Table 4

Receiver operating characteristic curve and diagnostic test values for the logistic regression models

Area under the receiver operating characteristic curve95% CISensitivity (%)Specificity (%)PPV (%)NPV (%)Correctly classified (%)Gold standard receiver operating characteristic curve
Carstairs index0.800.78 to 0.8010.6096.7037.7685.8084.43χ2 Valuep Value
SCO0.790.78 to 0.802.9499.5944.1090.0889.77Scottish Index of Multiple Deprivation vs Carstairs18.1≤0.001
Scottish Index of Multiple Deprivation0.810.80 to 0.826.0098.8844.7287.4386.68Scottish Index of Multiple Deprivation vs SCO11.39<0.001
χ2=21.67 (p≤0.001)Tested independently for each model
  • NPV, negative predictive value; PPV, positive predictive value; SCO, Social Class based on Occupation.