Table 3.
Observer agreement for measuring lung cancer nodules (n = 51) and masses (n = 37)
| Perfusion parameters | Intra‐observer agreement | Inter‐observer agreement | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| ICC | MD ± SD (%) | 95% limits (%) | RC (%) | WCV (%) | ICC | MD ± SD (%) | 95% limits (%) | RC (%) | WCV (%) | |
| Pulmonary flow | ||||||||||
| Nodules | 0.907 | −2.14 ± 23.8 | −48.9 to 44.6 | 46.7 | 16.8 | 0.937 | −6.91 ± 27.3 | −60.5 to 46.7 | 53.6 | 19.8 |
| Masses | 0.966 | −1.3 ± 16.4 | −33.6 to 30.9 | 32.2 | 11.5 | 0.939 | −4.8 ± 20.1 | −44.2 to 34.7 | 39.5 | 14.4 |
| Bronchial flow | ||||||||||
| Nodules | 0.976 | 4.90 ± 22.47 | −39.1 to 48.9 | 44.0 | 16.1 | 0.942 | 16.5 ± 51.0 | −83.6 to 116.6 | 100.1 | 37.6 |
| Masses | 0.952 | 2.5 ± 14.9 | −26.8 to 31.7 | 29.3 | 10.6 | 0.891 | −0.5 ± 17.3 | −34.5 to 33.4 | 33.9 | 12.1 |
| Pulmonary index | ||||||||||
| Nodules | 0.967 | −2.31 ± 14.7 | −31.2 to 26.5 | 28.8 | 10.4 | 0.952 | −5.55 ± 19.4 | −43.6 to 32.5 | 38.0 | 14.1 |
| Masses | 0.910 | −2.2 ± 13.2 | −28.1 to 23.8 | 26.0 | 9.4 | 0.902 | −0.6 ± 18.8 | −37.4 to 36.2 | 36.8 | 13.1 |
95% limits, 95% limits for mean difference; ICC, intraclass correlation coefficient for a single measure; MD, mean difference; RC, reproducibility coefficient; WCV, within‐subject coefficient of variation.