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Table 2 Intrasession standard errors of measurement of 3D scapular attitudes calculated in three static shoulder positions.

From: The reliability of three-dimensional scapular attitudes in healthy people and people with shoulder impingement syndrome

    Intrasession standard errors of measurement (in degrees)
    Healthy subjects SIS subjects
      Impaired shoulder Non-impaired shoulder
    n = 30 shoulders n = 8 shoulders n = 8 shoulders
Arm Positions Scapular Rotations   Trials 1-2-3 Trials 1–2 Trials 1–2 Trials 1–2
Rest A-PT SEM 1.6 1.9 2.4 1.6
   95%CI [1.4–2.0] [1.5–2.5] [1.6–4.8] [1.1–3.2]
  L-MR SEM 1.9 2.2 1.0 1.4
   95%CI [1.6–2.3] [1.8–3.0] [0.7–2.0] [1.0–2.9]
  PRO-RET SEM 2.2 2.4 0.8 2.3
   95%CI [1.9–2.7] [1.9–3.2] [0.5–1.5] [1.5–4.7]
Flexion 70° A-PT SEM 1.0 1.2 1.1 0.6
   95%CI [0.9–1.3] [1.0–1.6] [0.7–2.2] [0.4–1.3]
  L-MR SEM 1.3 1.2 1.5 0.8
   95%CI [1.1–1.6] [0.9–1.6] [1.0–3.0] [0.5–1.5]
  PRO-RET SEM 1.9 1.6 0.8 1.4
   95%CI [1.6–2.3] [1.3–2.1] [0.5–1.6] [0.9–2.9]
Abduction 90° A-PT SEM 1.0 0.9 0.8 1.1
   95%CI [0.8–1.2] [0.7–1.2] [0.5–1.6] [0.7–2.3]
  L-MR SEM 1.5 1.6 1.2 1.0
   95%CI [1.3–1.8] [1.3–2.1] [0.8–2.4] [0.7–2.1]
  PRO-RET SEM 1.9 1.7 1.3 1.7
   95%CI [1.6–2.3] [1.4–2.3] [0.8–2.6] [1.1–3.5]
  1. Abbreviations: A-PT, anterior-posterior tilting; L-MR, lateral-medial rotation; PRO-RET, protraction-retraction; SIS, shoulder impingement syndrome; Trial 1-2-3, standard errors of measurement calculated using the three trials of the first session; Trial 1–2, standard errors of measurement calculated using the two first trials of the first session; SEM, standard errors of measurement; 95%CI; 95% confidence interval.
  2. The method of calculation relative to the trunk was used to calculate the 3D scapular attitudes.