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Table 2 Drop-out analysis

From: Effects of weekly pain monitoring on back pain outcomes: a non-randomised controlled study

Patient characteristics at baseline SMS group
OR (95% CI)
N = 1,013 responders
N = 610 non-responders
Control group
OR (95% CI)
N = 802 responders
N = 423 non-responders
Interaction between group and characteristic
OR (p-value)
Age (years) 0.98 (0.97–0.99) 0.97 (0.96–0.98) 1.01 (p = 0.1)
Female (ref. male) 0.99 (0.80–1.21) 0.80 (0.63–1.02) 1.23 (p = 0.2)
Back pain intensity, NRS (0–10) 1.01 (0.96–1.06) 1.02 (0.96–1.08) 0.99 (p = 0.8)
Activity limitation, RMDQ (0–100) 1.00 (1.00–1.00) 1.00 (1.00–1.01) 1.00 (p = 0.8)
Ability to control pain, NRS (0–10) 0.92 (0.88–0.96) 0.94 (0.89–0.99) 0.98 (p = 0.5)
Recovery expectations, NRS (0–10) 0.98 (0.94–1.01) 0.98 (0.94–1.02) 0.99 (p = 0.8)
STarT risk profile
Low (ref)
Medium 1.09 (0.86–1.39) 0.95 (0.72–1.25) 1.15 (p = 0.4)
High 1.49 (1.14–1.95) 1.36 (1.00–1.85) 1.10 (p = 0.6)
Episode duration
 < 1 week (ref)
1–4 weeks 0.92 (0.71–1.19) 0.96 (0.71–1.29) 0.95 (p = 0.8)
1–3 months 0.79 (0.55–1.12) 0.73 (0.50–1.08) 1.08 (p = 0.8)
 > 3 months 1.13 (0.86–1.49) 1.41 (1.02–1.96) 0.80 (p = 0.3)
  1. Odds ratios for non-response at 12 months follow-up for the SMS group and the control group
  2. NRS = Numeric Rating Scale; RMDQ = Roland Morris Disability Questionnaire; STarT = The Keele STarT Back Screening Tool; OR = Odds ratio; CI = confidence interval; ref = reference group