Study groups and variables | Optimum cut-off value | Sensitivity | Specificity | Accuracy | PPV at pretest probability | NPV at pretest probability = 10% | ||
---|---|---|---|---|---|---|---|---|
50% | 90% | |||||||
DNR X DR | ||||||||
VEGF (ng/ml) | 124.7 | 73.1 | 80 | 74.4 | 78.5 | 97.1 | 96.4 | |
Sorbitol (mg/ml) | 0.3112 | 75.4 | 80 | 76.2 | 79 | 97.1 | 96.7 | |
DNR X NPDR | ||||||||
VEGF (ng/ml) | 285.8 | 66.7 | 60.5 | 62.7 | 62.8 | 93.8 | 94.2 | |
Sorbitol (mg/ml) |
0.4065 | 68.8 | 75.6 | 73.1 | 73.8 | 96.2 | 95.6 | |
NPDR X PDR | ||||||||
VEGF (ng/ml) | 173.9 | 79.2 | 93.3 | 84.6 | 92.2 | 99.1 | 97.6 | |
Sorbitol (mg/ml) | 0.3363 | 79.2 | 100 | 87.2 | 100 | 100 | 97.7 |