Fig. 4

Estimated LBP trajectory 3 weeks before and after visits to a chiropractor, Dysfunctional sub-group (n = 73), MC, Maintenance Care; LBP, Low Back Pain; CIDYS, Dysfunctional; the final GEE model was fitted with an unstructured correlation structure and included the variables: ‘Treatment group’, ‘Time (study period)’, ‘Time (treatment period)’ and ‘Treatment group*Time (treatment period)’