Convergent validity of the interRAI-HC for societal costs estimates in comparison with the RUD Lite instrument in community dwelling older adults

TitleConvergent validity of the interRAI-HC for societal costs estimates in comparison with the RUD Lite instrument in community dwelling older adults
Publication TypeJournal Article
Year of Publication2016
Authorsvan Lier LI, van der Roest HG, van Hout HPJ, van Eenoo L, Declercq A, Garms-Homolova V, Onder G, Finne-Soveri H, Jónsson PV, Hertogh CMPM, Bosmans JE
JournalBMC Health Services Research
Date PublishedAug 25 2016
ISBN Number1472-6963 (Electronic)<br/>1472-6963 (Linking)
Accession Number27561315
Keywords*Community care, *Convergent validity, *Correlation, *Costs of care, *InterRAI-HC, *Older adults, *Resource utilisation, *Routine care assessment, *RUD Lite, *Societal costs, Aged, Aged, 80 and over, Delivery of Health Care/economics/statistics & numerical data, Europe, Female, Geriatric Assessment, Health Care Costs/*statistics & numerical data, Health Resources, Home Care Services/*economics, Humans, Independent Living/*economics, Male, Models, Economic, Self Report

BACKGROUND: The interRAI-Home Care (interRAI-HC) instrument is commonly used in routine care to assess care and service needs, resource utilisation and health outcomes of community dwelling home care clients. Potentially, the interRAI-HC can also be used to calculate societal costs in economic evaluations. The purpose of this study was to assess the convergent validity of the interRAI-HC instrument in comparison with the RUD Lite instrument for the calculation of societal costs among care-dependent community dwelling older adults. METHODS: A within-subject design was used. Participants were 65 years and older and received professional community care in five countries. The RUD Lite was administered by trained (research) nurses or self-reports within 4 weeks after the interRAI-HC assessment. Agreement between the interRAI-HC and RUD Lite estimates was assessed using Spearman's correlation coefficients. We hypothesised that there was strong correlation (Spearman's rho > 0.5) between resource utilisation estimates, costs of care estimates and total societal cost estimates derived from both instruments. RESULTS: Strong correlation was found between RUD Lite and interRAI-HC resource utilisation assessments for eight out of ten resource utilisation items. Total societal costs according to the RUD Lite were statistically significantly lower than according to the interRAI-HC (mean difference euro-804, 95 % CI -1340; -269). The correlation between the instruments for total societal costs and all six cost categories was strong. CONCLUSIONS: The interRAI-HC has good convergent validity as compared with the RUD-Lite instrument to estimate societal cost of resource utilisation in community dwelling older adults. Since interRAI-HC assessments are part of routine care in many community care organisations and countries already, this finding may increase the feasibility of performing economic evaluations among community dwelling older adults.




Short TitleBMC health services research
Alternate JournalBMC Health Serv Res