Development of a measure to assess the quality of proxy decisions about research participation on behalf of adults lacking capacity to consent: the Combined Scale for Proxy Informed Consent Decisions (CONCORD scale).

The CONCORD scale provides a brief measure to evaluate the quality of decisions made on behalf of an adult who lacks the capacity to consent in non-emergency settings, enabling the evaluation of interventions to improve proxy decision quality. Initial evaluation indicates it has content adequacy and is feasible to use. Further statistical validation work is being undertaken.