Rasch analysis and impact factor methods both yield valid and comparable measures of health status in interstitial lung disease

A.S. Patel, R.J. Siegert, S. Bajwah, K. Brignall, H.R. Gosker, J. Moxham, T.M. Maher, E.A. Renzoni, A.U. Wells, I.J. Higginson, S.S. Birring*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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OBJECTIVES: Rasch analysis has largely replaced impact factor methodology for developing health status measures. The aim of this study was to develop a health status questionnaire for patients with interstitial lung disease (ILD) using impact factor methodology and to compare its validity with that of another version developed using Rasch analysis. STUDY DESIGN AND SETTING: A preliminary 71-item questionnaire was developed and evaluated in 173 patients with ILD. Items were reduced by the impact factor method (King's Brief ILD questionnaire, KBILD-I) and Rasch analysis (KBILD-R). Both questionnaires were validated by assessing their relationship with forced vital capacity (FVC) and St Georges Respiratory Questionnaire (SGRQ) and by evaluating internal reliability, repeatability, and longitudinal responsiveness. RESULTS: The KBILD-R and KBILD-I comprised 15 items each. The content of eight items differed between the KBILD-R and KBILD-I. Internal and test-retest reliability was good for total scores of both questionnaires. There was a good relationship with SGRQ and moderate relationship with FVC for both questionnaires. Effect sizes were comparable. Both questionnaires discriminated patients with differing disease severity. CONCLUSION: Despite considerable differences in the content of retained items, both KBILD-R and KBILD-I questionnaires demonstrated acceptable measurement properties and performed comparably in a clinical setting.
Original languageEnglish
Pages (from-to)1019-1027
Number of pages9
JournalJournal of Clinical Epidemiology
Issue number9
Publication statusPublished - Sept 2015


  • Interstitial lung disease
  • Health status
  • Rasch analysis
  • Impact factor
  • King's Brief Interstitial Lung Disease questionnaire
  • Quality of life


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