RT Journal Article SR Electronic T1 Can child restraint product information developed using consumer testing sustain correct use 6 months after child restraint purchase? Study protocol for a cluster randomised controlled trial JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP injuryprev-2017-042571 DO 10.1136/injuryprev-2017-042571 A1 Julie Brown A1 Jane Elkington A1 Alexandra Hall A1 Lisa Keay A1 Judith L Charlton A1 Kate Hunter A1 Sjaan Koppel A1 Andrew Hayen A1 Lynne E Bilston YR 2018 UL http://injuryprevention.bmj.com/content/early/2018/03/07/injuryprev-2017-042571.abstract AB Background With long-standing and widespread high rates of errors in child restraint use, there is a need to identify effective methods to address this problem. Information supplied with products at the point of sale may be a potentially efficient delivery point for such a countermeasure. The aim of this study is to establish whether product materials developed using a consumer-driven approach reduce errors in restraint use among purchasers of new child restraint systems.Methods A cluster randomised controlled trial (cRCT) will be conducted. Retail stores (n=22) in the greater Sydney area will be randomised into intervention sites (n=11) and control sites (n=11), stratified by geographical and socioeconomic indicators. Participants (n=836) will enter the study on purchase of a restraint. Outcome measures are errors in installation of the restraint as observed by a trained researcher during a 6-month follow-up home assessment, and adjustment checks made by the parent when the child is placed into the restraint (observed using naturalistic methods). Process evaluation measures will also be collected during the home visit. An intention-to-treat approach will be used for all analyses. Correct use and adjustment checks made by the parent will be compared between control and intervention groups using a logistic regression model. The number of installation errors between groups will be compared using Poisson regression.Discussion This cRCT will determine the effectiveness of targeted, consumer-driven information on actual error rates in use of restraints. More broadly, it may provide a best practice model for developing safety product information.Trial registration number ACTRN12617001252303p; Pre-results.