Content validity of the illness perceptions questionnaire – revised among people with type 2 diabetes: A think-aloud study
Objectives
: to access the cognitions of adults with type 2 diabetes whilst completing items on the Illness Perceptions Questionnaire – Revised (IPQ-R). To determine whether these cognitions are congruent with the meaning of items and subscales as interpreted by
researchers and clinicians using the IPQ-R and to identify the nature and extent of problems that individuals experience when completing the IPQ-R.
Design : participants (n = 36) were recruited from a primary care diabetes clinic and a hospital diabetes clinic. They were asked to complete the IPQ-R using a ‘think-aloud’ methodology.
Main outcome measures : transcripts were analysed to identify instances where participants expressed problems with item completion, or where there was inconsistency between verbal and written responses.
Results : the most problematic subscales were those of ‘personal control’ and ‘consequences’.
Conclusion : generally, participants found the IPQ-R unproblematic. However, participants had problems with the concept of ‘cure’ and ‘symptoms’ in the context of type 2 diabetes, and with the negative phrasing used in some items. These findings have important implications for the interpretation of IPQ-R scores, particularly when the IPQ-R is used as the basis for individualised interventions among people with type 2 diabetes.
Design : participants (n = 36) were recruited from a primary care diabetes clinic and a hospital diabetes clinic. They were asked to complete the IPQ-R using a ‘think-aloud’ methodology.
Main outcome measures : transcripts were analysed to identify instances where participants expressed problems with item completion, or where there was inconsistency between verbal and written responses.
Results : the most problematic subscales were those of ‘personal control’ and ‘consequences’.
Conclusion : generally, participants found the IPQ-R unproblematic. However, participants had problems with the concept of ‘cure’ and ‘symptoms’ in the context of type 2 diabetes, and with the negative phrasing used in some items. These findings have important implications for the interpretation of IPQ-R scores, particularly when the IPQ-R is used as the basis for individualised interventions among people with type 2 diabetes.
Keywords: IPQ-R; illness perceptions questionnaire; illness representations; think-aloud; type 2 diabetes
Document Type: Research Article
Affiliations: 1: Marie Curie Cancer Care, Marie Curie Hospice Belfast, Belfast, UK 2: School of Psychology, Queen’s University Belfast, University Road Belfast, UK, 3: Praxis Care, Lisburn Road Belfast, UK 4: Clinical Psychology Service, Northern Health & Social Care Trust, Ballymena, UK
Publication date: 01 June 2013
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