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Epidemiological study of the survival time of persons killed in road traffic accidents

, : Epidemiological study of the survival time of persons killed in road traffic accidents. Nihon University Journal of Medicine 25(2): 85-104

In 2623 persons killed in road traffic accidents, the survival time, or the time lapse between the affliction of injuries from the accident and resultant death, was obtained. The survival ratio and cumulative mortality ratio were calculated for each survival time group. These data were analyzed according to the victims' ages, types of accidents, body regions of the main injuries, and the time of accident occurrence. The mortality ratio was 33.9% for the first 30 min, 41.3% for 1 h, 70.0% for 24 h, and 93.6% for 30 days after the accident. Those who survived for 1 yr or more comprised 0.6% of the total deaths. The survival time was short in the groups of young people, automobile drivers and passengers, people with neck injuries and victims of nighttime accidents. In the case of old people, pedal cyclists, pedestrians, people with extremity injuries and victims of daytime accidents, a larger proportion of the victims died after a long survival time. The survival time thus differed according to various factors. With the cumulative mortality ratio as the dependent variable (y1, y2, y3) and the logarithmically transformed survival time as the independent variable (t1, t2, t3), linear regression models were formulated such as: y1 = 0.4169 + 0.2080 log t1 (0.5 .ltoreq. t1 .ltoreq. 24 h), y2 = 0.7005 + 0.1652 log t2 (1 < t2 .ltoreq. 30 days) and y3 = 0.9363 + 0.0577 log t3 (1 < t3 .ltoreq. 12 mo.). The residuals of the actual values with respect to those calculated from these models were quite small.

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