What is new?
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Individual data from five population-based studies were used to calculate valid weights for diseases included in multimorbidity indices.
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Homogenous results for the impact of seven out of 10 chronic diseases on self-reported health status across five studies were obtained.
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Compared with past approaches, where weights were mostly calculated on the basis of very specific study population such as hospital patients, it is the first attempt to use representative data from more than one