Outcomes reported in interventional studies for mild cognitive impairment: a scoping umbrella review to inform core outcome set development.

There is currently no consensus on the most important treatment outcomes in patients with mild cognitive impairment (MCI). As part of developing a core outcome set for MCI, we conducted a pragmatic scoping umbrella review to summarize outcomes reported in previous studies. Six electronic databases were searched from inception to August 2023. Systematic and scoping reviews in English with ≥70% of studies describing at least one quantitative outcome of interventions involving adults with MCI were eligible. Verbatim outcomes were extracted from eligible papers within selected reviews. From 170 papers covering 153 studies from 42 reviews, 143 unique outcomes were identified. Global cognition was the only outcome reported by more than 50% of studies. Two-thirds of outcomes were reported by no more than three studies. Heterogeneous outcome reporting limits evidence synthesis and treatment evaluation. A core outcome set for MCI is warranted to standardize outcome reporting and offer stronger evidence for decision-making.