Methods: Systematic review registered with PROSPERO (CRD420201724090), with searches in nine bibliographic databases, from inception to 21/01/20. Reference lists of retrieved articles were hand-searched. Eligible studies measured multimorbidity for any purpose in primary care, community or hospital populations. Two reviewers independently reviewed the retrieved
studies. We used descriptive analyses to understand characteristics and patterns of multimorbidity measures.
Findings: In total, 566 studies were included in this review. 36% of studies did not explicitly report how they defined multimorbidity and 13% did not report the conditions their measure included. The number of conditions included in measures ranged from 2 to 285 (median 17, interquartile range 11-23). 98% of measures included at least one cardiovascular condition, compared to at least one metabolic and endocrine (97%), respiratory (93%), musculoskeletal
(88%) and mental health (79%) condition, whereas chronic infections (27%), haematological (24%), ENT (24%), skin (16%) and oral (4%) conditions were uncommonly included. Only eight individual conditions were included by more than half of studies (diabetes, stroke, cancer, COPD, hypertension, coronary heart disease, chronic kidney disease and heart failure), none of which were mental health conditions.
Interpretation: Measurement of multimorbidity is poorly reported and very variable. Consistent reporting of measure definitions should be required by journals, and consensus studies are needed to define core and optional conditions to include.
|Journal||The Lancet Public Health|
|Publication status||Accepted/In press - 5 May 2021|