Table 2

Comparison between reports of lines with or without contrast

No contrastContrast
Values are number of reports (range of reported percentages). Three reports (one from each observer) were obtained for each radiograph. Reported positions are different between non-contrast and contrast groups (p = 0.0002).
Number of reports318288
Positions reported
Distal vein50 (13–19%)68 (22–25%)
Iliac25 (6–11%)33 (9–14%)
Superior or inferior vena cava105 (30–36%)103 (30–40%)
Atrium80 (22–30%)62 (19–24%)
Ventricle21 (4–11%)6 (0–4%)
Other37 (7–17%)16 (2–7%)