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Table 2 Model 1: Prediction of self-reported overall improvement by changes in present pain (NRS) and Bournemouth Questionnaire (BQ)

From: An observational study on trajectories and outcomes of chronic low back pain patients referred from a spine surgery division for chiropractic treatment

  B (SE) Exp B (Odds Ratio) 95% CI Exp B p
PGIC 1 week: Nagelkerke R2 = 0.03–0.10
 Change NRS present pain −0.03 (0.15) 0.97 0.72–1.31 0.842
 Change BQ total score 0.04 (0.03) 1.04 0.98–1.11 0.178
PGIC 1 month: Nagelkerke R2 = 0.23–0.30
 Change NRS present pain 0.16 (0.11) 1.17 0.95–1.44 0.134
 Change BQ total score 0.06 (0.03) 1.06 1.00–1.12 0.039
PGIC 3 months: Nagelkerke R2 = 0.31–0.48
 Change NRS present pain 0.04 (0.14) 1.05 0.80–1.37 0.743
 Change BQ total score 0.10 (0.04) 1.11 1.02–1.20 0.013
PGIC 6 months: Nagelkerke R2 = 0.42–0.46
 Change NRS present pain 0.24 (0.12) 1.27 0.99–1.61 0.056
 Change BQ total score 0.08 (0.03) 1.08 1.02–1.15 0.016
PGIC 12 months: Nagelkerke R2 = 0.32–0.43
 Change NRS present pain 0.04 (0.14) 1.04 0.79–1.37 0.794
 Change BQ total score 0.09 (0.04) 1.10 1.02–1.18 0.021
  1. Logistic regressions with PGIC (0 = not improved, 1 = improved) of each time point as dependent variable and the changes in NRS and BQ as independent variables
  2. BQ Bournemouth Questionnaire, NRS Numeric rating scale, PGIC Patient Global Impression of Change