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Comment on: A critical analysis of the internal logic in the Life-Space Assessment (LSA) composite score and suggested solutions

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Background:An individual’s ability to live independently is commonly measured in health research interested in identifying risk factors associated with disablement processes. In order to inform clinical practice, population research has attempted to identify the contraction of “lived-space” by using various survey instruments.Problem:Studies assessing habitual movements over the environment with the Life-Space Assessment (LSA) survey instrument should carefully consider how the LSA Composite Score (LSA-CS) is computed. Until now, no publication has carefully delineated the assumptions guiding the internal logic used in the computation of the LSA-CS.Core argument:Because the internal logic of the LSA may need further justification, a non-data-editing scoring algorithm should be considered.Solution:Compute LSA-CS by only using non-edited data.Specific aim:Paper first delineates the logic guiding the algorithm used in the formation of the LSA-CS and explains how the scoring creates and changes participant re...