Translation, validation and reliability of the Dutch Late-Life Function and Disability Instrument Computer Adaptive Test

Abstract

Background: Being able to adequately assess physical function and disability in the elderly population is vital for estimating and predicting healthcare needs in clinical practice. The Late-Life Function and Disability Instrument Computer Adapted Test (LLFDICAT) was developed to assess physical functioning and disability in gerontology research and clinical practice. The LLFDICAT appears to be a promising instrument for the assessment of physical function and disability in the elderly. The aim of this study was to translate the LLFDICAT to the Dutch language and to investigate the validity and reliability in a sample of Dutch-speaking community dwelling older persons. Methods: The item bank of the LLFDICAT was translated using a forward-backward method. A sample of 40 older adults was recruited and completed the LLFDICAT, WHO-Disability Assessment Schedule 2.0 (WHODAS 2.0), PF-10 and 10-meter walk test (10MWT). The LLFDICAT was retested in two to ten days. Pearson’s r was calculated to assess the concurrent validity of the LLFDICAT and the ICC 2,1, SEM and SDC were calculated to assess reliability. Results: A correlation of r = 0,804 was found between the LLFDICAT Function scale and the PF-10. Additionally, the LLFDICAT Disability scale showed a negative correlation with both the WHODAS 2.0 (r = -0,657) and the 10MWT (r = -0,614). The LLFDICAT Function scale showed an ICC of 0,904 (95% Confidence Interval 0,827-0,948), with a low SEM (2,51 points) and SDC (6,97 points). The LLFDICAT Disability scale showed slightly higher values for the ICC (0,775; 95% Confidence Interval 0,613-0,874) the SEM (4,28 points) and the SDC (11,86 points). Conclusions: The Dutch LLFDICAT shows strong validity and high reliability when used to assess physical function and disability in community dwelling elderly. The LLFDICAT is a short, valid and reliable instrument for use in both research and clinical practice settings.