TABLE 2.

The intra‐ and inter‐observer reliability for CSA

	Mean ± SD	ICC (95% CI)	P value
X‐ray
Assessor 1 1.	31.7 ± 4.2
Assessor 1 2.	32.2 ± 4.3	0.971 (0.931–0.984)	<0.001*
Assessor 2	32.0 ± 4.3	0.966 (0.953–0.975)	<0.001*
3D‐CT
Assessor 1 1.	31.8 ± 4.4
Assessor 1 2.	31.8 ± 4.5	0.994 (0.992–0.996)	<0.001*
Assessor 2	31.7 ± 4.6	0.987 (0.983–0.990)	<0.001*

Abbreviations: 3D‐CT, three‐dimensional computed tomography; CSA, critical shoulder angle; SD, standard deviation.

^*Statistically significant.