title: Evaluation of the psychometric properties of the BCPT Symptom Checklist with a sample of breast cancer patients before and after adjuvant therapy.
abstract: OBJECTIVE
  The purpose of this analysis was to provide psychometric information related to the Breast Cancer Prevention Trial (BCPT) Symptom Checklist in women with breast cancer prior to the initiation of adjuvant therapy and 6 months post-initiation of therapy.
  
  
  METHODS
  This investigation was a secondary analysis of baseline data from the Anastrozole Use in Menopausal Women (AIM) Study (R01 CA 107408). The data used in this study were obtained from women diagnosed with Stage I, II, and IIIa breast cancer and who received adjuvant therapy that included chemotherapy alone, anastrozole alone, and chemotherapy plus anastrozole. Data were examined before adjuvant therapy (n=278), and at 6 months post-adjuvant therapy (n=195). Construct validity was examined through exploratory and confirmatory factor analysis (CFA), and the internal consistency of each resulting subscale was computed. Discriminant validity evidence was obtained by correlating BCPT subscales with subscales from the MOS SF-36.
  
  
  RESULTS
  A seven-factor structure was extracted from the 42 items at baseline; an eight-factor structure was found using 6-month data. CFA was performed to compare the baseline and 6-month models as well as an eight-factor model recommended by Cella et al. Findings revealed that the two eight-factor models best represented the data. Low negative correlations with the subscales of the MOS SF-36 provided discriminant validity evidence.
  
  
  CONCLUSIONS
  This analysis provides evidence for the reliability, discriminant validity, and factor structure of the BCPT Symptom Checklist. Further testing of this instrument is needed to confirm the factor structure of this measure.
authors.affiliation: Center for Research and Evaluation, University of Pittsburgh School of Nursing, Pittsburgh, PA 15261, USA. lat15@pitt.edu
authors.forename: Lauren
authors.initials: L
authors.lastname: Terhorst
authors.forename: Heather
authors.initials: H
authors.lastname: Blair-Belansky
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Moore
authors.forename: Catherine
authors.initials: C
authors.lastname: Bender
mesh_terms: D000368:Aged; D000077384:Anastrozole; D018931:Antineoplastic Agents, Hormonal / Q000627:therapeutic use; D001943:Breast Neoplasms / Q000188:drug therapy / Q000503:physiopathology* / Q000523:psychology*; D057189:Checklist / Q000706:statistics & numerical data*; D017024:Chemotherapy, Adjuvant / Q000523:psychology*; D003071:Cognition; D004414:Dyspareunia; D005260:Female; D019584:Hot Flashes; D006801:Humans; D008875:Middle Aged; D009325:Nausea; D009570:Nitriles / Q000627:therapeutic use; D010146:Pain; D011594:Psychometrics / Q000295:instrumentation; D015203:Reproducibility of Results; D057566:Self Report; D014230:Triazoles / Q000627:therapeutic use; D014549:Urinary Incontinence; D015431:Weight Loss
chemical_list: D018931:Antineoplastic Agents, Hormonal; D009570:Nitriles; D014230:Triazoles; D000077384:Anastrozole