This technical report presents results from the 2021 National Survey of the Use of Booster Seats (NSUBS), the only probability-based nationwide child restraint use survey in the United States that observes restraint use and interviews an adult occupant to collect age, gender, height, weight, race, ethnicity, and other data. NHTSA’s National Center for Statistics and Analysis conducts the NSUBS. The 2021 NSUBS found that 31.0 percent of 4- to 7-year-old children were restrained in booster seats in 2021 as compared to 37.0 percent in 2019 when the last NSUBS was conducted. This was not a statistically significant change. Restraint use for all children under 13 was 89.8 percent in 2021, not statistically different than the 2019 estimate of 87.9 percent. There were some indications of premature transition to restraint types that are not appropriate for children’s age, height, and weight.
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