Table 7. Multinomial Regression Analysis of the Acromial Morphology for RCT Size.

Multinomial logistic regression		OR (95% CI)	p-value
Small-to-medium (ref. massive)†
	LAA	0.99 (0.92–1.06)	0.663
	CSA	0.89 (0.76–1.04)	0.132
	AT	1.10 (0.99–1.23)	0.078
	APCI	1.17 (0.60–2.26)	0.649
	AHI	3.37 (2.42–4.69)	< 0.001*
	Anterior glenoid coverage†	1.017 (0.95–1.09)	0.647
Large (ref. massive)†
	LAA	0.94 (0.87–1.00)	0.057
	CSA	0.84 (0.73–0.98)	0.022*
	AT	1.05 (0.95–1.16)	0.366
	APCI	1.20 (0.63–2.27)	0.577
	AHI	1.72 (1.32–2.24)	< 0.001*
	Anterior glenoid coverage†	1.04 (0.97–1.12)	0.246

RCT: rotator cuff tear, OR: odds ratio, CI: confidence interval, LAA: lateral acromial angle, CSA: critical shoulder angle, AT: acromial tilt, APCI: anteroposterior coverage index, AHI: acromiohumeral interval.

^*Statistically significant. ^†According to the classification by Beeler et al.⁵⁾