title: Measuring health anxiety: moving past the dichotomous response option of the original Whiteley Index.
abstract: The Whiteley Index [WI; Pilowsky, I. (1967). Dimensions of hypochondriasis. British Journal of Psychiatry, 113, 89-93] is a widely used self-report measure of health anxiety, hypochondriasis, and illness phobia; however, the factor structure of the WI has proven unstable. Moreover, factorial investigations of the WI persist in the original true/false response format despite criticisms of dichotomous scales and the availability of a Likert scale version [Barsky, A. J., Cleary, P. D., Wyshak, G., Spitzer, R. L., Williams, J. B. W., & Klerman, G. L. (1992). A structured diagnostic interview for hypochondriasis: a proposed criterion standard. The Journal of Nervous and Mental Disease, 180, 20-27]. The current investigation explores the factor structure of the 5-point Likert scale version of the WI using a sample of 287 students (64 men, ages 18-34 [M=20.6; SD=3.2]; 223 women ages 18-45 [M=20.2; SD=3.2]) divided into two sex-matched groups. A 2-factor 8-item model was extracted from the first group using exploratory factor analysis. However, confirmatory factor analysis with the second group showed superior fit to the data using a precedent 2-factor 6-item model, demonstrating factorial invariance across response options. Comprehensive results, implications, and directions for future research are discussed.
authors: The Anxiety and Illness Behaviour Laboratory, Department of Psychology, University of Regina, 3737 Wascana Parkway, Regina, S4S 0A2 Saskatchewan, Canada.
authors: Patrick G
authors: PG
authors: Welch
authors: R Nicholas
authors: RN
authors: Carleton
authors: Gordon J G
authors: GJ
authors: Asmundson
mesh_terms: D000293:Adolescent; D000328:Adult; D001007:Anxiety / Q000175:diagnosis* / Q000523:psychology; D001294:Attitude to Health; D003469:Culture; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D006998:Hypochondriasis / Q000175:diagnosis* / Q000523:psychology; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000706:statistics & numerical data; D015203:Reproducibility of Results; D055815:Young Adult