Agreement between patient self-reported and assessor-rated frailty using the Clinical Frailty Scale.

There were 531 participants with both self-reported and assessor-reported Clinical Frailty Scale.

Assessor-rated scores were systematically higher than self-rated scores by a mean of 0.45 points (95% CI 0.39-0.52; P<0.001).

When predicting death or new disability, paired receiver operating characteristic curve analysis revealed no difference in discriminative capability of self-rated or assessor-rated Clinical Frailty Scale assessment (c-statistic difference 0.010 [95% CI -0.072 to 0.092; P=0.81]).