Table 4.

Z-line visualization

	Group A (standing)	Group B (supine)	Group C (right supine)	P value
%	4/30 (15.8%)	11/30 (37.3%)	27/30 (90%)	< 0.0011
Mean % Z-line	8.68 ± 22.96	25.16 ± 34.52	71.33 ± 33.47	< 0.0012
Mean frames	0.21 ± 0.53	3.23 ± 6.59	5.53 ± 7.55	0.0172
	Standing vs supine	Standing vs right supine	Supine vs right supine
% patients	P = 0.0273	P < 0.0013	P < 0.0013	(-)
Mean % Z-line	NS4	P < 0.0014	P < 0.0014	(-)
Mean frames	NS4	P = 0.0024	NS4	(-)

¹Pearson-Fischer χ² test;

²ANOVA test;

³Pearson-Fischer χ² test;

⁴Tamhane test (post-hoc comparisons).