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The problem
Intervention: Use of child restraint systems (car seats) compared to seat belts for children aged 6 to 11 years
Who it was tested with: Children aged 6 to 11 years involved in motor vehicle crashes evaluated at trauma centers in the United States (2017-2020).
Children or communities are compared with a group that did not receive the intervention, or followed over years. This is the design that best separates what the intervention did from everything else that changed.
"This retrospective cohort study of children 6 to 11 years old who were involved in motor vehicle crashes evaluated at trauma centers used inverse probability of treatment weighting with gradient boosting machine-derived propensity scores and restricted cubic spline modeling to evaluate height-dependent associations between protective device and injury pattern." The quasi-experimental propensity score approach with stratification by height allows examination of associations between restraint type and injury patterns while accounting for differences between groups.
Study only includes injured children who reached trauma centers; does not measure overall injury prevention efficacy or crash outcomes in the general population. Confounding by crash severity, seating position, and other unmeasured factors cannot be excluded.
Across countries and designs
1 study · 1 country
