title: A test to measure lift capacity of physically impaired adults. Part 2--Reactivity in a patient sample.
abstract: METHODS
  Test reactivity is the based on the idea that experience with a test may affect performance on subsequent tests, independent of what the test purports to measure. The reactivity of a test of lift capacity was studied in a single-blind randomized clinical trial was studied in a single-blind randomized clinical trial in which subjects were assigned to one or two groups. One group received lift testing before and after a therapeutic trial, while the other group received lift testing only at the conclusion of the therapeutic trial.
  
  
  OBJECTIVE
  To measure the reactivity of a lift capacity test over the course of treatment.
  
  
  BACKGROUND
  The reactivity of a test is an important criterion by which an outcome measure must be judged. Change in response to treatment is assumed to be independent of changes resulting from the evaluee's experience with the test, although this is rarely addressed.
  
  
  METHODS
  The EPIC Lift Capacity test was administered to 55 patients with low back pain in a treatment program after they were randomized into a pre-test/post-test and a post-test only group. Additional measures were taken on a pre-test/post-test basis for all subjects.
  
  
  RESULTS
  Analyses of variance demonstrated no difference between the randomized groups after treatment. However, the pre-test/post-test group demonstrated significant improvement over the course of treatment. Other measures of outcome were similarly affected.
  
  
  CONCLUSIONS
  The reactivity of the EPIC Lift Capacity test was negligible over an 8-week treatment regimen that did not include lifting tasks.
authors.affiliation: Program in Occupational Therapy, Washington University School of Medicine, St. Louis, Missouri, USA.
authors.forename: L N
authors.initials: LN
authors.lastname: Matheson
authors.forename: V
authors.initials: V
authors.lastname: Mooney
authors.forename: D
authors.initials: D
authors.lastname: Holmes
authors.forename: S
authors.initials: S
authors.lastname: Leggett
authors.forename: J E
authors.initials: JE
authors.lastname: Grant
authors.forename: S
authors.initials: S
authors.lastname: Negri
authors.forename: B
authors.initials: B
authors.lastname: Holmes
mesh_terms: D000328:Adult; D000367:Age Factors; D001824:Body Constitution; D005260:Female; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000175:diagnosis / Q000534:rehabilitation*; D017770:Lifting; D017116:Low Back Pain / Q000175:diagnosis / Q000534:rehabilitation*; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D015203:Reproducibility of Results; D016037:Single-Blind Method; D014938:Work Capacity Evaluation