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To compare characteristics and restraint use between a population-based and fitting service sample of child restraint users. Characteristics of the two samples were compared using chi-squared tests. Differences in errors in restraint use observed in the two samples were modeled using logistic regression. There were significant differences in child age ( p  &lt; 0.001), and restraint types ( p  &lt; 0.001) between the two samples, with more younger children in the fitting service sample. Controlling for differences in restraint type, the odds that adult participants were female were 61% less in the fitting service sample than in the population-based sample (OR 0.39, 95%CI 0.21–0.71). The odds that adult participants perceived a large risk associated with restraint misuse (OR 3.62, 95%CI 1.33–9.84), had a household income in the highest bracket (OR 3.89, 95%CI 1.20–12.62) and were living in areas of highest socioeconomic advantage (OR 2.72, 95%CI 1.22–6.06) were approximately three times higher in the fitting service sample. Overall, more participants had errors in restraint use in the population-based sample ( p  = 0.021). However, after controlling for restraint type, securing errors were three times more likely (OR 3.34, 95%CI 1.12–10.2), and serious installation errors were almost twice as likely (OR 1.91, 95% CI 1.09–3.39) in the fitting service sample. While less resource intensive, convenience and/or fitting service samples may be less representative than population-based samples. Given the need for efficiency, methods that combine randomized population-based invitations to participate in restraint fitting check day events across geographically representative areas may be useful for ongoing surveillance of child restraint use.

Differences in participant characteristics and observed child restraint use between population-based and restraint fitting service samples