Fig. 2.

COSMIN (COnsensus-based Standards for the selection of health Measurement Instruments) risk of bias: review authors'judgements about the final rating of each measurement property presented as percentages across all included studies using the descriptive system. COSMIN risk of bias: very good, adequate, doubtful or inadequate quality. Each measurement property was presented with the total number of studies (n) assessed. We considered criterion validity when studies correlated the EQ-5D instruments with a recognized disease-specific gold standard