Supported Decision-Making Inventory: Psychometric Validation of the Catalan and Spanish Versions.

Everyone was recruited through service providers in Catalonia, so the results may not carry over to other regions or other service systems. Scores were compared with a set of personal and environmental characteristics, but not with other measures of self-determination, quality of life or support needs, so it is not known how this inventory relates to tools already in use. The study was done at a single point in time, so it says nothing about whether scores change when a person's support changes. Personal factors was the weakest area, the two environment subscales cannot be combined, and the wording and clarity of some items, particularly in the Spanish version, still need review. No norms were produced, so a score has to be read against the person's own situation rather than against a population average. The study was not preregistered, and the environment analysis did not fully meet its statistical assumptions, so those links should be read as patterns rather than causes.

The authors state they have nothing to report for funding and declare no conflicts of interest.

Higher scores on this inventory are not a measure of a person's decision-making ability, and the finding that people under guardianship report fewer decision-making opportunities does not show that guardianship causes that. The study was cross-sectional, so the direction is unknown, and the two environment subscales cannot be added into one score.