Table 3.

Spearman’s correlation matrix between AP radiographs for AA*

AA	Supine		Standing		Sitting
	r	p	r	p	r	p
Supine	1	–	0.864	< 0.001	0.378	< 0.001
Standing			1	–	0.403	< 0.001
Sitting					1	–

* There is a strong correlation between images of the supine and standing positions; AA = abduction angle.