Investigating if changing the wording of a study invitation letter increased recruitment in a project promoting tobacco cessation in a town with high smoking rates.
Schell C; Godinho A; Cunningham JA · 2026 · Substance abuse treatment, prevention, and policy
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
BACKGROUND: Invitation letters can be the first point of contact between research staff and potential participants and a number of modifiable variables have been studied to improve their effectiveness. The aim of this analysis was to…
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Metadata source: Europe PMC · DOI 10.1186/s13011-026-00704-x