title: The factor structure and reliability of the Illness Attitude Scales in a student and a patient sample.
abstract: BACKGROUND
  The Illness Attitude Scales (IAS), designed by Kellner in 1986, assesses fears, beliefs, and attitudes associated with hypochondriasis and abnormal illness behaviour. However, its factor structure is, especially for translations of the IAS, not sufficiently explored. Thus, the present Study aimed to analyse the factor structure of the IAS in a German student and a patient population using exploratory factor analysis.
  
  
  METHODS
  A mixed student (N = 296) and a mixed patient (N = 130) sample completed the IAS. The data was submitted to principal components analyses (PCA) with subsequent oblique rotations. From identified factor structures, scales were derived and submitted to reliability analyses as well as to a preliminary validity analysis.
  
  
  RESULTS
  The PCA revealed a four-factor solution in the student sample: (1) fear of illness and death; (2) treatment experience; (3) hypochondriacal beliefs; and (4) effect of symptoms. In the patient sample, the data was best explained by a two-factor solution: (1) health related anxiety and (2) effect of symptoms and treatment experience. All scales reached good to acceptable reliability coefficients. The scales derived from the student sample and those derived from the patient sample were able to distinguish between pain patients and a matched group of normal controls.
  
  
  CONCLUSIONS
  Our data suggests that the IAS is in student samples best represented by a four factor-solution and in patient samples by a two-factor-solution.
authors.affiliation: Department of Psychology I, University of Wuerzburg, Marcusstr, 9-11, 97070 Wuerzburg, Germany. alexander@croessmann.org
authors.forename: Alexander
authors.initials: A
authors.lastname: Crössmann
authors.forename: Paul
authors.initials: P
authors.lastname: Pauli
mesh_terms: D000328:Adult; D001294:Attitude to Health; D003469:Culture; D003643:Death; D005163:Factor Analysis, Statistical; D005239:Fear; D005260:Female; D015438:Health Behavior; D006801:Humans; D006998:Hypochondriasis / Q000523:psychology*; D007802:Language; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D013334:Students / Q000523:psychology*