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The Nordic Maintenance Care program: Effectiveness of chiropractic maintenance care versus symptom-guided treatment for recurrent and persistent low back pain—A pragmatic randomized controlled trial

Fig 4

Mean difference in number of days with bothersome LBP per week, secondary analysis.

Variables in GEE model: Group, Time, Time2, Group*Time, Group*Time2, Number of days with pain week 1 of study period, Clinician, Pain intensity at baseline, Use of analgesic medication during inclusion period; the difference is statistically significant (at 5% level) between week 13 to 43; LBP, Non-specific Low Back Pain; MC, Maintenance Care; C, Control; 95% CI, 95% Confidence Interval.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0203029.g004