Table 2.
Relative negative predictive value, relative positive predictive value, sensitivity and specificity at various CSF RBC ranges for traumatic and SAH diagnostic groups. SAH RBC values in parentheses; 95% confidence inter vals in parentheses; p-values < 0.001
| Tube 4 RBCs | SAH (n=11) | Traumatic LPs (n=288) | Negative Predictive Value | Positive Predictive Value | Sensitivity | Specificity |
|---|---|---|---|---|---|---|
| 0–500 | 0 | 252 | 100% | 0% | 100% (89.0–100%) | 87.5% (86.3–87.5%) |
| 500–1,000 | 1 (990) | 19 | 95% | 5% | 90.9% (79.2–99.5%) | 94.1% (92.9–94.4%) |
| 1,000–5,000 | 1 (1434) | 14 | 93.3% | 6.7% | 81.8% (72.8–96.3%) | 87.5% (86.3–87.5%) |
| 5,000–10,000 | 1 (5894) | 3 | 75% | 25% | 72.7% (57.3–72.7%) | 100% (99.0–100%) |
| 10,000–20,000 | 2A (11,665) (12,657) | 0 | 0% | 100% | 54.5% (40.2–54.5%) | 100% (99.1–100%) |
| 20,000–100,000 | 3 (21,345) (62,301) (63,124) | 0 | 0% | 100% | 27.3% (18.8–27.3%) | 100% (99.3–100%) |
| 100,000–1,000,000 | 2 (100,322) (870,412) | 0 | 0% | 100% | 9.1 % (1.5–9.1%) | 100% (99.7–100%) |
| >1,000,000 | 1 (2,223,563) | 0 | 0% | 100% | 0% | 100% |