Epidemiology of Motor Vehicle Injuries in Suffolk County, New York before and after Enactment of the New York State Seat Belt Use Law
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1989-06-01
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Edition:Final report
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Abstract:A population-based study of hospital and medical examiner reported vehicular trauma was conducted to determine the efficacy of the New York Law which compared pre-law 1984 occurrence and severity patterns with those of post-law 1985. Vehicles and occupants covered by the Law were identified primarily by matching the hospital cases with official crash reports; 95% of the covered cases (N=2152) were matched. From a census of medical examiner's cases covered by the Law (N=192), all were matched. During October 1984, pre-law observed seat belt usage in Suffolk County was 16%. A nearly fourfold increase in usage was observed in January 1985, when the Law was first enforced; in April of that year observed usage declined to 54%; by September usage dropped to 44%. The initial sharp increase in usage patterns during the first quarter of 1985 was coupled with an estimated 20% decrease in vehicular injury occurrence rates for drivers of vehicles covered by the Law. The proportion of drivers with head and brain injuries decreased by 32% and all facial injuries, including those of the forehead, decreased 28%. In contrast, cervical strain and facial fractures increased during that period. Over the entire 1985 post-law study period, similar changes in injury patterns were evident. Covered drivers across all ages experienced reductions of 18% in head and brain injury, 17% in facial injuries and 20% in forehead injuries; however, they also incurred a 35% increase in cervical strain. These findings demonstrate a clear shift in the pattern of injuries and a concomitant decline in their severity. The findings are consistent with the hypothesis that promulgation and enforcement of belt use laws are contributing to a reduction in the overall occurrence of vehicular injuries and the severity of head injuries. /Abstract from report summary page/
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