Estimating non-fatal road casualties in a large French county, using the capture-recapture method |
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Authors: | Amoros Emmanuelle Martin Jean-Louis Laumon Bernard |
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Affiliation: | Epidemiological Research and Surveillance Unit in Transport, Occupation and Environment UMRESTTE, French National Institute for Transport and Safety Research INRETS, Bron, F-69500, France. amoros@inrets.fr |
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Abstract: | INTRODUCTION: Non-fatal road casualties are under-reported, with official figures coming from the police. In the French Rh?ne county, a road trauma registry constitutes a second source of reporting but its completeness needs to be assessed. We also wish to estimate an incidence rate of non-fatal road casualties that is corrected for under-count. METHODS: Having two sources of reporting available, we can apply the capture-recapture method under certain conditions. To take into account different reporting probabilities among casualties, the capture-recapture analysis is stratified according to injury severity (New Injury Severity Score=NISS), road user type and human third party. To evaluate the sensitivity of the capture-recapture estimate on the number of matched casualties between the police file and the registry, three scenarios of record-linkage are considered. RESULTS: For serious (NISS 9+) non-fatal road casualties, the police ascertainment rate is at most 57%, the registry ascertainment rate is at most 87%, and the aggregate ascertainment rate is at most 95%. The ascertainment-corrected incidence rate for serious (NISS 9+) non-fatal road casualties is at least 65 per 100,000. CONCLUSION: The degree of completeness of the registry for serious casualties is rather high, though not satisfactory. |
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Keywords: | Capture-recapture Ascertainment rate Record-linkage Road trauma registry Injury severity Under-reporting |
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