title: Change in psychosocial distress associated with pain and functional status outcomes in patients with lumbar impairments referred to physical therapy services.
abstract: METHODS
  Prospective, longitudinal, observational cohort design.
  
  
  OBJECTIVE
  The primary aim was to examine the association between changes in psychosocial distress (PD), and functional status (FS) and pain intensity at discharge from physical therapy.
  
  
  BACKGROUND
  Patients with lumbar impairments seeking physical therapy commonly demonstrate elevated PD. However, it is not clear if PD changes that occur during physical therapy management are associated with improved clinical outcomes.
  
  
  METHODS
  Data from adults (n = 692) with lumbar impairment were analyzed. Patients were screened using the Symptom Checklist Back Pain Prediction Model questionnaire (SCL BPPM) to identify patients at intake and discharge into 3 levels of risk for persistent disability (high, intermediate, or low). SCL BPPM classifications allowed for 5 patterns of change in PD during therapy (decreased, stable low, stable intermediate, stable high, or increased). Associations between PD change patterns and discharge FS and pain intensity were assessed using multivariable linear regression models, controlling for selected risk-adjustment variables.
  
  
  RESULTS
  Proportions of patients classified by patterns of PD change for decreased, stable low, stable intermediate, stable high, and increased were 0.34, 0.52, 0.05, 0.06, and 0.03, respectively. Compared to the decreased PD group, (1) increased, stable high, and stable intermediate PD patterns were associated with worse discharge FS scores (-7.9 [95% CI: -13.5, -2.21], -10.9 [95% CI: -15.25, -6.49], and -8.9 [95% CI: -13.65, -4.21] units, respectively), and (2) stable high and stable intermediate PD patterns were associated with higher pain intensity (2.59 [95% CI: 1.81, 3.56] and 2.14 [95% CI: 1.25, 3.04] units, respectively).
  
  
  CONCLUSIONS
  Lower FS and higher pain intensity outcomes were associated in similar but not identical patterns with patients whose SCL BPPM classification of PD increased, or remained at high or intermediate levels during physical therapy. Serial assessments of change in PD during rehabilitation are recommended as a possible treatment-monitoring tool.
authors.affiliation: CentraState Medical Center, Freehold, NJ 07728, USA. mwerneke@centrastate.com
authors.forename: Mark W
authors.initials: MW
authors.lastname: Werneke
authors.forename: Dennis L
authors.initials: DL
authors.lastname: Hart
authors.forename: Steven Z
authors.initials: SZ
authors.lastname: George
authors.forename: Daniel
authors.initials: D
authors.lastname: Deutscher
authors.forename: Paul W
authors.initials: PW
authors.lastname: Stratford
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D017116:Low Back Pain / Q000523:psychology* / Q000628:therapy; D008297:Male; D008875:Middle Aged; D026741:Physical Therapy Modalities; D011446:Prospective Studies; D020127:Recovery of Function; D016896:Treatment Outcome; D055815:Young Adult