Interobserver Measurements for Quantification on SPECT/CT Perfusion Studies
| Site | Mean | Mean absolute difference | Intraclass correlation coefficient | SEM for ICC |
| Total right lung | 55.1 (35.8–76.9) | 0.3 (0–1.6) | 0.998 (0.996–0.999) | 0.810 |
| Total left lung | 44.9 (23.1–64.2) | 0.3 (0–1.6) | 0.998 (0.996–0.999) | 0.810 |
| Right upper lobe | 21.9 (1.8–38.5) | 0.7 (0–2.1) | 0.993 (0.984–0.997) | 1.321 |
| Right middle lobe | 8.7 (1.7–14.1) | 1.0 (0–3.2) | 0.922 (0.841–0.963) | 1.832 |
| Right lower lobe | 24.6 (13.1–39.3) | 0.9 (0–3.5) | 0.984 (0.966–0.992) | 1.830 |
| Left upper lobe | 23.8 (6.0–36.0) | 0.3 (0–1.7) | 0.990 (0.979–0.995) | 1.278 |
| Left lower lobe | 21.5 (8.1–33.8) | 0.6 (0–3.3) | 0.989 (0.977–0.995) | 1.390 |
Data in parentheses are range for mean and mean absolute difference and are 95% confidence interval for ICC.