Studies investigate the meaning of 'multimorbidity' and how much it costs us plos plosmedicine
, and now poses major challenges to health care systems worldwide. The rise in health care spending in many developed countries and the prevalence of multimorbidity are interlinked but the relationship is not well understood.
In the first study, Clare MacRae of the University of Edinburgh, Scotland, and colleagues analyzed English primary care data on nearly 1.2 million people registered with 149 general medical practices. Using nine published lists of medical conditions, they showed that varying the individual conditions considered to contribute to multimorbidity leads to large differences when calculating multimorbidity prevalence.
The prevalence of multimorbidity when only the two commonest conditions were considered was 4.6%, rising to 29.5% considering the 10 commonest, 35.2% considering the 20 commonest, and 40.5% when considering all 80 conditions. Across the whole population, 52 of the 80 possible conditions are/would be required to reach a multimorbidity prevalence of >99%. This varies according to age.
"There is a need for standardization when measuring multimorbidity prevalence so that results across studies are comparable and population subgroups are accurately represented," the authors say. In the second study, Angela Chang of the University of Southern Denmark, Copenhagen, and colleagues used data from private health insurance claims of more than 16 million unique enrollees ages 18 to 64 in the United States. Including 63 chronic conditions, the team found that 56.2% of the study population had at least twoWhen they looked at every possible two- or three-disease combinations, they discovered that 60.
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