A classification tree to assist with routine scoring of the Clinical Frailty Scale

Olga Theou, Mario Ulises Pérez-Zepeda, Alexandra M van der Valk, Samuel D Searle, Susan E Howlett, Kenneth Rockwood, Olga Theou, Mario Ulises Pérez-Zepeda, Alexandra M van der Valk, Samuel D Searle, Susan E Howlett, Kenneth Rockwood

Abstract

Background: the Clinical Frailty Scale (CFS) was originally developed to summarise a Comprehensive Geriatric Assessment and yield a care plan. Especially since COVID-19, the CFS is being used widely by health care professionals without training in frailty care as a resource allocation tool and for care rationing. CFS scoring by inexperienced raters might not always reflect expert judgement. For these raters, we developed a new classification tree to assist with routine CFS scoring. Here, we test that tree against clinical scoring.

Objective/methods: we examined agreement between the CFS classification tree and CFS scoring by novice raters (clerks/residents), and the CFS classification tree and CFS scoring by experienced raters (geriatricians) in 115 older adults (mean age 78.0 ± 7.3; 47% females) from a single centre.

Results: the intraclass correlation coefficient (ICC) for the CFS classification tree was 0.833 (95% CI: 0.768-0.882) when compared with the geriatricians' CFS scoring. In 93%, the classification tree rating was the same or differed by at most one level with the expert geriatrician ratings. The ICC was 0.805 (0.685-0.883) when CFS scores from the classification tree were compared with the clerk/resident scores; 88.5% of the ratings were the same or ±1 level.

Conclusions: a classification tree for scoring the CFS can help with reliable scoring by relatively inexperienced raters. Though an incomplete remedy, a classification tree is a useful support to decision-making and could be used to aid routine scoring of the CFS.

Keywords: ageing; classification tree; clinical frailty scale; frailty; older people.

© The Author(s) 2021. Published by Oxford University Press on behalf of the British Geriatrics Society. All rights reserved. For permissions, please email: journals.permissions@oup.com.

Figures

Figure 1
Figure 1
The Clinical Frailty Scale classification tree.
Figure 2
Figure 2
Agreement on CFS scoring between the classification tree and the two healthcare professional raters.

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Source: PubMed

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