Sensitivity and specificity of PPD to identify CACS in patients with exercise-induced leg pain (n=477)
| Variable | Observer 1 | Observer 2 |
| Sensitivity (%) | 75 | 67 |
| Specificity (%) | 54 | 65 |
| Positive predictive value (%) | 47 | 51 |
| Negative predictive value (%) | 80 | 78 |
CACS, chronic anterior compartment syndrome; PPD, patient pain drawing.