Table 2.
Results for the assessment of interobserver variability in determining cavoatrial junction position on chest X-ray
| Variability measures | All n = 23 | Consultants n = 13 | Trainees n = 10 |
|---|---|---|---|
| n | 374 | 204 | 170 |
| Mean difference (cm) | −0.3 | −0.5 | −0.1 |
| SD (cm) | 1.1 | 1.1 | 1.1 |
| Lower 95% LOA | −2.5 | −2.6 | −2.4 |
| Upper 95% LOA | 1.8 | 1.5 | 2.1 |
| RC | 2.2 | 2.1 | 2.2 |
| >1 cm (n) (%) | 124 (33%) | 71 (35%) | 53 (31%) |
| >2 cm (n) (%) | 37 (10%) | 22 (11%) | 15 (9%) |
LOA, limits of agreement; n, number of paired measurements; RC, coefficient of repeatability; SD, standard deviation.
Mean difference refers to the differences between Observer 1 measurements and the remaining observers for each of the 18 images.