Observer 1 | Observer 2 | Interobserver: observer 1 v observer 2 | |||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Conventional probe | VAE probes | Conventional probe | VAE probes | Conventional probe | VAE probes | ||||||||||||||
Performance orientation | True diameter mean min–max (n=20) | ICC | Diffmean | ± SDD (± % SDD) | ICC | Diffmean | ± SDD (± % SDD) | ICC | Diffmean | ± SDD (± % SDD) | ICC | Diffmean | ± SDD (± % SDD) | ICC | Diffmean | ± SDD (± % SDD) | ICC | Diffmean | ± SDD (± % SDD) |
VAE probe, variable angulated elongated probe (see text); accuracy, observed diameter minus true diameter; intraobserver reliability, agreement between 1st versus 2nd sets of estimates by each observer; interobserver reliability, agreement between the 1st sets of estimates by each observer; orientation, orientation of probe in relation to lesion (see fig 1); ICC, intraclass correlation coefficient (2.1) for agreement between observed diameter and true diameter (accuracy) and between repeated measurements; diffmean, mean of the difference scores (observed diameter minus true diameter); SDD, ± 1.96 standard deviations of the difference scores; (% SDD), SDD expressed as a percentage of maximum lesion size ((SDD/max diameter) × 100). | |||||||||||||||||||
Accuracy | |||||||||||||||||||
Parallel | 8 (5–17) | 0.82 | 0 | 3 (18) | 0.93 | 0 | 2 (12) | 0.14 | −4 | 5 (29) | 0.66 | −1 | 4 (24) | ||||||
Orthogonal | 14 (4–36) | 0.93 | 1 | 5 (14) | 0.96 | 0 | 4 (11) | 0.59 | −6 | 6 (17) | 0.93 | −2 | 4 (11) | ||||||
Reliability | |||||||||||||||||||
Parallel | 8 (5–17) | 0.77 | 0 | 3 (18) | 0.92 | 0 | 2 (12) | 0.63 | 0 | 2 (12) | 0.71 | 0 | 4 (24) | 0.18 | −4 | 4 (24) | 0.58 | 0 | 5 (29) |
Orthogonal | 14 (4–36) | 0.95 | 0 | 5 (14) | 0.98 | 1 | 3 (8) | 0.94 | 0 | 4 (11) | 0.96 | 0 | 4 (11) | 0.54 | −8 | 6 (17) | 0.95 | 2 | 4 (11) |