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Table 2: PPVs And NPVs at different levels of assumed prevalence for identifying mass effect and vasogenic edema^{^a}
Assumed Prevalence Thin Series Thick Series
PPV (95% CI) NPV (95% CI) PPV (95% CI) NPV (95% CI)
Mass effect 
 0.05 33.2 (24.7–48.7) 99.8 (99.7–99.9) 42.1 (31.6–58.7) 99.7 (99.6–99.8)
 0.10 51.2 (40.9–66.7) 99.6 (99.4–99.8) 60.6 (49.4–75.0) 99.4 (99.2–99.6)
 0.15 62.5 (52.4–76.1) 99.3 (99.0–99.6) 70.9 (60.8–82.7) 99.1 (98.8–99.4)
 0.20 70.3 (60.9–81.8) 99.1 (98.6–99.5) 77.6 (68.7–87.1) 98.8 (98.3–99.2)
Vasogenic edema 
 0.05 42.3 (29.1–68.9) 99.4 (99.0–99.9) 51.4 (38.7–72.1) 99.5 (99.1–99.7)
 0.10 60.7 (46.4–82.4) 98.8 (97.9–99.7) 69.1 (57.1–84.5) 98.9 (98.1–99.5)
 0.15 71.1 (57.9–88.1) 98.2 (96.7–99.6) 78.0 (67.9–89.6) 98.2 (97.0–99.2)
 0.20 77.7 (66.1–91.3) 97.4 (95.3–99.4) 83.4 (75.0–92.5) 97.4 (95.9–98.8)
↵a These measurements are based on the same operating points used to determine sensitivity and specificity in Table 1.