Sequential area under the receiver operator characteristic (ROC) curve as successive variables are added (p values given for comparison with previous model unless specified)
| Model | 1 | 2 | 3 | 4 | 5 | 6 | Centor |
|---|---|---|---|---|---|---|---|
| Severely inflamed tonsils | +Short duration | +Fever in the last 24 h | +Pus | +No cough or coryza | +Muscle aches | Vs model 5 | |
| Second data set (p) | 0.575 (0.538, 0.612) | 0.644 (0.596, 0.692) (p=0.006) | 0.689 (0.634, 0.738) (p=0.003) | 0.702 (0.651, 0.748) (p=0.104) | 0.713 (0.661, 0.758) (p=0.803) | 0.708 (0.668, 0.762) (p=0.334) | 0.650 (0.600, 0.700) (p=0.123) |
| First data set (p) | 0.602 (0.562, 0.641) | 0.676 (0.631, 0.720) (p=<0.001) | 0.706 (0.660, 0.751) (p=0.017) | 0.713 (0.665, 0.761) (p=0.597) | 0.735 (0.690, 0.779) (p=0.025) | 0.738 (0.705, 0.791) (p=0.143) | 0.716 (0.674, 0.758) (p=0.291) |