title: Complexity of GPs' explanations about mental health problems: development, reliability, and validity of a measure.
abstract: BACKGROUND
  How GPs understand mental health problems determines their treatment choices; however, measures describing GPs' thinking about such problems are not currently available.
  
  
  OBJECTIVE
  To develop a measure of the complexity of GP explanations of common mental health problems and to pilot its reliability and validity.
  
  
  METHODS
  A qualitative development of the measure, followed by inter-rater reliability and validation pilot studies.
  
  
  METHODS
  General practices in North London.
  
  
  METHODS
  Vignettes of simulated consultations with patients with mental health problems were videotaped, and an anchored measure of complexity of psychosocial explanation in response to these vignettes was developed. Six GPs, four psychologists, and two lay people viewed the vignettes. Their responses were rated for complexity, both using the anchored measure and independently by two experts in primary care mental health. In a second reliability and revalidation study, responses of 50 GPs to two vignettes were rated for complexity. The GPs also completed a questionnaire to determine their interest and training in mental health, and they completed the Depression Attitudes Questionnaire.
  
  
  RESULTS
  Inter-rater reliability of the measure of complexity of explanation in both pilot studies was satisfactory (intraclass correlation coefficient = 0.78 and 0.72). The measure correlated with expert opinion as to what constitutes a complex explanation, and the responses of psychologists, GPs, and lay people differed in measured complexity. GPs with higher complexity scores had greater interest, more training in mental health, and more positive attitudes to depression.
  
  
  CONCLUSIONS
  Results suggest that the complexity of GPs' psychosocial explanations about common mental health problems can be reliably and validly assessed by this new standardised measure.
authors.affiliation: Camden and Islington Foundation Trust, St Pancras Hospital, 4 St Pancras Way, London. j.cape@ucl.ac.uk
authors.forename: John
authors.initials: J
authors.lastname: Cape
authors.forename: Elena
authors.initials: E
authors.lastname: Morris
authors.forename: Mary
authors.initials: M
authors.lastname: Burd
authors.forename: Marta
authors.initials: M
authors.lastname: Buszewicz
mesh_terms: D001291:Attitude of Health Personnel; D005194:Family Practice / Q000193:education / Q000592:standards*; D006801:Humans; D001523:Mental Disorders / Q000175:diagnosis / Q000628:therapy*; D010817:Physician-Patient Relations; D010821:Physicians, Family / Q000523:psychology*; D010865:Pilot Projects; D011364:Professional Practice; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires