Population aging and increasing in long-term care needs call for designing and implementing better tools for assessing functional ability. In Chile, the Lawton & Brody (L&B) scale is used for identifying limitations with instrumental activities. This study compares the costs and acceptability of the L&B with a new instrument to measure IADL: the Instrument for the Assessment of Functionality Stages (IDEEF). Phone surveys were carried out to apply the L&B and the IDEEF to a sample of 200 older people (60+) participating in public programs for older people in the Metropolitan Region, Chile. Besides the items assessed by each scale, the survey captured completion times and included a short questionnaire on acceptability, data that allowed comparisons between instruments. On average, the L&B takes around 4 minutes to be applied; the completion times for the IDEEF are four times longer. However, the IDEEF performs better in terms of acceptability and has neither gender bias nor dependency bias. Both instruments have pros and cons but the IDEEF appears as a feasible alternative to the L&B to improve the assessment of IADL in the country.
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