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Table 2 Univariate linear regression for the dependent variable SPADI after 1 year and coefficients with CI for Beta

From: Predictors of Shoulder Pain and Disability Index (SPADI) and work status after 1 year in patients with subacromial shoulder pain

SPADI total
  R2 Beta 95% CI
(for B)
p-value
n = 104     
Socio-demographic variables:     
   Gender (1,2) 0.7% 4.05 (-6.2 to 14.3) p = 0.44
   Age 0.9% -0.24 (-0.75 to 0.27) p = 0.35
   Education (0,1) 14.4% -18.9 (-28.4 to -9.4) p < 0.01
   Work status (0,1) 8.0% 14.7 (4.1 to 25.3) p = 0.007
Variables from self-reported questionnaire:     
Duration of pain (0-2) 4.5%    
3-6 monthsb     
6-12 months   4.0 (-9.1 to 17.2) p = 0.54
> 12 months   9.7 (-0.62 to 20.1) p = 0.065
   Medication (0,1) 0.7% 4.1 (-6.2 to 14.4) p = 0.43
   Distress (HSCL 25) 3.4% 10.3 (-1 to 21.6) p = 0.073
   Health stat (EQ-VAS) 7.5% -0.4 (-0.7 to -0.1) p = 0.008
   Pain at rest 11.9% 4.3 (1.9 to 6.7) p = 0.001
   Self-eff for pain(sum) 8.9% 6.0 (2.0 to 9.9) p = 0.004
   Baseline SPADI 14.3% 0.46 (0.22 to 0.67) p < 0.001
   Prev should pain(0,1) 5.2% 11.5 (1.3 to 21.8) p = 0.028
   Neck pain (0,1) 2.0% 7.0 (-3.3 to 17.3) p = 0.18
   Prev physiot(0,1) 2.6% 8.0 (-2.2 to 18.2) p = 0.12
Active range of motions affected side (impairments):     
   Flexion 3.3% -0.18 (-0.39 to 0.21) p = 0.078
   Hand-Behind -Back 4.1% -1.75 (-3.5 to -0.004) p = 0.05
  1. b Reference category
  2. Gender (1: male, 2: female)
  3. Education (0: ≤ 12 years in school, 1: College/University)
  4. Work status (0: not working, 1: working or partly working, retired not included)
  5. Medication (0: no regular use of medicine, 1: daily or weekly use of medicine)
  6. Self-efficacy for pain: a sumscore of 4 questions (mean)
  7. Previous shoulder pain (0: no,1: yes)
  8. SPADI: 11 missing, Work status: 13 missing