Methods: Emergency Medical Technicians (EMTs) identified all 12 MTTC variables applicable to the trauma victims delivered to three hospitals in the study site between October 2001 and May 2002.

• 方法：在2001年12月至2002年5月，紧急救护员依据重大外伤判断准则修订版的12个变数，判断病人是否为重大外伤。