To explore risk factors in the effectiveness of prehospital care on severe traffic injuries.

The "120" dispatch data and prehospital records from 2011 to 2015 in Shenzhen were sorted out. The possible factors likely related to the effectiveness of prehospital care were taken into account so as to find the risk factors through univariate and multivariate stepwise logistic regression analyses.

A total of 488 casualties were enrolled in this study. Among them, prehospital measures on 347 casualties were ineffective and the ineffectiveness rate was 71.1%. The following factors have statistical significance after univariate analyses: sex, age, injured body parts, coma, PHI, response time and prehospital measures. After multivariate analyses, 5 factors were identified as risk factors as follow: injured body parts, coma, PHI, response time and prehospital measures.

Injured parts, coma and PHI are important factors on the effectiveness of prehospital care, and shortening response time and professionalizing prehospital care can improve the effectiveness of prehospital care and therefore the prognosis of severe trauma patients.