Receiver operating characteristic curve and diagnostic test values for the logistic regression models
| Area under the receiver operating characteristic curve | 95% CI | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Correctly classified (%) | Gold standard receiver operating characteristic curve | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Carstairs index | 0.80 | 0.78 to 0.80 | 10.60 | 96.70 | 37.76 | 85.80 | 84.43 | χ2 Value | p Value | |
| SCO | 0.79 | 0.78 to 0.80 | 2.94 | 99.59 | 44.10 | 90.08 | 89.77 | Scottish Index of Multiple Deprivation vs Carstairs | 18.1 | ≤0.001 |
| Scottish Index of Multiple Deprivation | 0.81 | 0.80 to 0.82 | 6.00 | 98.88 | 44.72 | 87.43 | 86.68 | Scottish Index of Multiple Deprivation vs SCO | 11.39 | <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.