Self-reported and performance-based mobility related to instrumental activities of daily living in women aged 62 years and older. A population study.

Abstract

This study investigated the association between self-reported and performance-based mobility and instrumental activities of daily living (IADL) in 854 women aged 62 years and older from population-based studies in Göteborg, Sweden. Self-reported mobility was assessed by asking the subjects if they experienced difficulties when walking outdoors, walking indoors and mounting stairs. Performance-based mobility was evaluated by a Postural-Locomotion-Manual (PLM) test, which objectively and precisely measured the subjects' mobility of lower and upper limbs and movement co-ordination using an optoelectronic technique. Independence/dependence in IADL was evaluated according to 4 activities, namely cleaning, shopping, transportation and cooking. IADL dependence associated with both self-reported difficulties in mobility and poor performance in the PLM test. A logistic regression analysis showed that self-reported mobility and the locomotion phase in the PLM test were two independent explanatory factors of IADL dependence. This study indicates that self-reported mobility and the PLM test can be used to evaluate the mobility components of daily life activities. The combination of these two methods improves the assessment of an individual's mobility, and defines a risk group of functional decline. Given the limitations of a cross-sectional design, further longitudinal studies are needed.