Sensitivity, Specificity, and Likelihood Ratios of V/Q SPECT According to Criteria Tested
| SPECT criteria | Sensitivity | Specificity | Positive likelihood ratio | Negative likelihood ratio |
| 1 segmental or subsegmental mismatch | 0.92 (0.84–1) | 0.84 (0.79–0.89) | 5.7 (4.1–8) | 0.10 (0.04–0.25) |
| ≥1 segmental mismatch | 0.86 (0.76–0.96) | 0.93 (0.89–0.96) | 11.4 (6.9–18.8) | 0.15 (0.08–0.31) |
| ≥2 segmental or subsegmental mismatches | 0.88 (0.79–0.97) | 0.95 (0.91–0.98) | 16.0 (8.9–28.6) | 0.13 (0.06–0.27) |
| ≥1 segmental or 2 subsegmental mismatches | 0.92 (0.84–1) | 0.91 (0.87–0.95) | 10.2 (6.5–16) | 0.09 (0.04–0.23) |
| >1 segmental mismatch | 0.82 (0.71–0.93) | 0.96 (0.93–0.99) | 20.4 (10.2–40.7) | 0.19 (0.11–0.35) |
| ≥2 segmental mismatches | 0.63 (0.51–0.78) | 0.97 (0.95–1) | 25.3 (10.4–61.7) | 0.38 (0.26–0.54) |
| ≥3 segmental or subsegmental mismatches | 0.67 (0.55–0.82) | 0.99 (0.97–1) | 44.9 (14.4–140.4) | 0.33 (0.22–0.50) |
Data in parentheses are 95% confidence intervals.