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Development of a Multivariate Prognostic Model for Pain and Activity Limitation in People With Low Back Disorders Receiving Physiotherapy

      Abstract

      Objective

      To identify predictors for back pain, leg pain, and activity limitation in patients with early persistent low back disorders (LBDs).

      Design

      Prospective inception cohort study.

      Setting

      Primary care private physiotherapy clinics in Melbourne, Australia.

      Participants

      Individuals (N=300) aged 18-65 years with low back and/or referred leg pain of ≥6 weeks and ≤6 months duration.

      Interventions

      Not applicable.

      Main Outcome Measures

      Numeric rating scales for back pain and leg pain as well as the Oswestry Disability Scale.

      Results

      Prognostic factors included sociodemographics, treatment related factors, subjective/physical examination, subgrouping factors, and standardized questionnaires. Univariate analysis followed by generalized estimating equations were used to develop a multivariate prognostic model for back pain, leg pain, and activity limitation. Fifty-eight prognostic factors progressed to the multivariate stage where 15 showed significant (P<.05) associations with at least 1 of the 3 outcomes. There were 5 indicators of positive outcome (2 types of LBD subgroups, paresthesia below waist, walking as an easing factor, and low transversus abdominis tone) and 10 indicators of negative outcome (both parents born overseas, deep leg symptoms, longer sick leave duration, high multifidus tone, clinically determined inflammation, higher back and leg pain severity, lower lifting capacity, lower work capacity, and higher pain drawing percentage coverage). The preliminary model identifying predictors of LBDs explained up to 37% of the variance in outcome.

      Conclusions

      This study evaluated a comprehensive range of prognostic factors reflective of both the biomedical and psychosocial domains of LBDs. The preliminary multivariate model requires further validation before being considered for clinical use.

      Keywords

      List of abbreviations:

      GEE (generalized estimating equation), GLMM (generalized linear mixed model), LBD (low back disorder)
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