Table 3.

Intersession standard errors of measurement of 3D scapular attitudes calculated in three static shoulder positions.

			Intersession standard errors of measurement (in degrees)
			Healthy subjects	SIS subjects
				Impaired shoulder	Non-impaired shoulder
Arm Positions	Scapular Rotations		n = 30 shoulders	n = 8 shoulders	n = 8 shoulders
Rest	A-PT	SEM	1.6	0.9	1.3
		95%CI	[1.3–2.2]	[0.6–1.7]	[0.8–2.6]
	L-MR	SEM	2.0	1.1	0.7
		95%CI	[1.6–2.7]	[0.7–2.2]	[0.5–1.5]
	PRO-RET	SEM	2.0	1.9	2.8
		95%CI	[1.6–2.6]	[1.3–3.9]	[1.8–5.6]
Flexion 70°	A-PT	SEM	1.8	1.3	1.8
		95%CI	[1.4–2.4]	[0.9–2.6]	[1.2–3.6]
	L-MR	SEM	2.5	1.3	1.2
		95%CI	[2.0–3.4]	[0.9–2.7]	[0.8–2.3]
	PRO-RET	SEM	4.2	1.6	1.6
		95%CI	[3.4–5.7]	[1.1–3.3]	[1.1–3.2]
Abduction 90°	A-PT	SEM	2.1	2.0	2.3
		95%CI	[1.7–2.9]	[1.3–4.0]	[1.5–4.6]
	L-MR	SEM	2.2	2.9	2.7
		95%CI	[1.7–2.9]	[1.9–5.8]	[1.8–5.6]
	PRO-RET	SEM	3.3	1.5	2.3
		95%CI	[2.6–4.4]	[1.0–3.1]	[1.5–4.7]

Abbreviations: A-PT, anterior-posterior tilting; L-MR, lateral-medial rotation; PRO-RET, protraction-retraction; SIS, shoulder impingement syndrome; SEM, standard errors of measurement; 95%CI; 95% confidence interval.

The method of calculation relative to the trunk was used to calculate the 3D scapular attitudes. The SEM were calculated using the mean of the two first trials of each session.