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. 2015 Sep 2;5(9):e008462. doi: 10.1136/bmjopen-2015-008462

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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HRs estimate the relative risk of incidence of disability in subgroups defined by sex, age, cognitive function and depressive symptoms in stratified analyses. HRs estimate the relative risk of disability incidence in those classified as prefrail or frail compared with those classified as robust (reference group) in a different subgroup defined by sex, age (74/75 years), cognitive function (Mini-Mental State Examination (MMSE) score 23/24) and depressive symptoms (Geriatric Depression Scale (GDS) score 5/6).