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Table 4 Interaction between treatment group and significant baseline predictor variables for back related dysfunction (Roland score).

From: Characteristics of patients with chronic back pain who benefit from acupuncture

Treatment   Roland, 8-week* Roland, 52-week*
group Predictor variable β** SE P-value β** SE P-value
Individualized acupuncture Baseline Roland score -0.48 0.12 <.0001 -0.23 0.13 0.07
  Baseline bothersomeness score 0.30 0.26 0.25 -0.13 0.28 0.64
  Age -0.01 0.05 0.86 -0.02 0.05 0.64
  Gender 0.93 1.24 0.45 -0.68 1.30 0.60
  Employment, heavy lifting 4.29 1.97 0.03 5.19 2.05 0.01
  Employment, light/medium lifting -0.34 1.62 0.83 2.18 1.69 0.20
  Employment, sedentary 1.34 1.67 0.42 2.73 1.76 0.12
  Medication use, narcotics 3.52 1.99 0.08 1.85 2.06 0.37
  Medication use, other 0.91 1.23 0.46 0.45 1.29 0.73
  Self-efficacy -6.17 2.98 0.04 -3.46 3.46 0.32
  Acupuncture expectation, top tertile -2.65 1.34 0.05 -0.98 1.42 0.49
  Acupuncture expectation, could not rate 1.43 1.57 0.36 -0.28 1.64 0.86
Standardized acupuncture Baseline Roland score -0.37 0.13 0.004 -0.24 0.13 0.07
  Baseline bothersomeness score 0.47 0.29 0.10 0.05 0.31 0.88
  Age 0.08 0.05 0.08 0.07 0.05 0.15
  Gender 0.90 1.19 0.45 1.57 1.25 0.21
  Employment, heavy lifting 3.00 1.97 0.13 3.03 2.08 0.15
  Employment, light/medium lifting -0.84 1.62 0.60 -0.67 1.69 0.69
  Employment, sedentary 1.00 1.63 0.54 2.47 1.72 0.15
  Medication use, narcotics 2.20 1.91 0.25 4.06 1.98 0.04
  Medication use, other 0.46 1.24 0.71 1.21 1.30 0.35
  Self-efficacy -2.91 3.32 0.38 1.67 3.49 0.63
  Acupuncture expectation, top tertile -1.26 1.31 0.34 -1.90 1.38 0.17
  Acupuncture expectation, could not know 1.17 1.56 0.45 1.27 1.63 0.44
Simulated acupuncture Baseline Roland score -0.41 0.13 0.001 -0.07 0.13 0.62
  Baseline bothersomeness score 0.13 0.26 0.62 -0.19 0.27 0.48
  Age 0.02 0.05 0.65 0.05 0.05 0.33
  Gender -0.48 1.22 0.69 -0.24 1.28 0.85
  Employment, heavy lifting 2.73 2.04 0.18 4.45 2.13 0.04
  Employment, light/medium lifting 0.02 1.66 0.99 -1.59 1.77 0.37
  Employment, sedentary -0.85 1.72 0.62 1.57 1.82 0.39
  Medication use, narcotics 4.81 1.96 0.01 2.71 2.05 0.19
  Medication use, other 1.17 1.24 0.35 1.60 1.32 0.23
  Self-efficacy 0.19 2.25 0.93 1.97 2.42 0.42
  Acupuncture expectation, top tertile -0.90 1.28 0.48 -2.91 1.35 0.03
  Acupuncture expectation, could not know 0.62 1.59 0.70 -0.17 1.66 0.92
  1. * For ease of identification, all independent variables with P < 0.5 are in boldface type
  2. ** The parameter estimates β refer to the amount of change in the outcome that is based on a one unit change in that covariate (continuous variables) or a change in category (categorical variables)