VALIDATION AND PSYCHOMETRIC EVALUATION OF A HEALTH CARE ORIENTATION ASSESSMENT

Author(s)

Bushnell DM*1;McCarrier KP1;Scanlon M1;Nelson DR2;Martin ML1, Buesching DP2 1Health Research Associates, Inc., Seattle, WA, USA, 2Eli Lilly and Company, Inc., Indianapolis, IN, USA

OBJECTIVES: The Provider-Dependent Health Care Orientation (PDHCO; Kaplan 1996) assesses an individual’s orientation towards health and health care and measures an individual’s dependence (i.e., passivity) related to health care and disease management. We sought to build on prior validation of the instrument by evaluating the reproducibility of the PDHCO and testing equivalence between paper and electronic administration modes.  METHODS: The PDHCO and other questionnaires were administered to a sample of adults recruited through web-based advertisements in 8 U.S. cities. Participants completed the PDHCO on paper and computerized formats in a randomized crossover design. A one-week retest was completed at home. Reproducibility and mode equivalence were assessed using the intraclass correlation coefficient (ICC). Cronbach’s alpha was calculated to assess internal consistency.  To assess convergent validity, the correlation of the PDHCO to the Communication With Physician (CWP) Scale of the Chronic Disease Self-Efficacy Scale was calculated. ANOVA was used to compare mean PDHCO scores among tertiles of the Health Assertiveness Scale (HAS). RESULTS:  Of the 230 participants that completed baseline assessment, 228 (99.1%) completed the one-week retest. The mean age of participants was 44.3 years, 51.3% were female, and 58.3% were Caucasian. A small number (n=9; 3.9%) reported their health as Poor. The mean PDHCO score was 49.7(±14.7), and the ICC between paper and computerized administration was 0.887. The ICC for the one-week retest of the paper format was 0.913, and the PDHCO was found to be internally consistent (Cronbach’s alpha=0.735). Significant correlations were found with the CWP (r=-0.246; p<.001), and the instrument discriminated between levels of the HAS (p<0.05). CONCLUSIONS: The PDHCO was observed to have adequate reproducibility and internal consistency as well as appropriate convergent validity.  The scale was found to significantly discriminate between levels of health assertiveness. Equivalence between paper and web-based administration was demonstrated.

Conference/Value in Health Info

2013-05, ISPOR 2013, New Orleans, LA, USA

Value in Health, Vol. 16, No. 3 (May 2013)

Code

PRM119

Topic

Economic Evaluation, Methodological & Statistical Research

Topic Subcategory

Cost-comparison, Effectiveness, Utility, Benefit Analysis, PRO & Related Methods

Disease

Diabetes/Endocrine/Metabolic Disorders, Mental Health, Musculoskeletal Disorders

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