Effects of clinical outcomes between patients performed ET or LT/PI within 4, 7 or 10 days.

ICU, intensive care unit; MV, mechanical ventilation; VAP, ventilator-associated pneumonia; ET, early tracheotomy; LT, late tracheotomy; PI, prolonged intubation; RR, relative risks; WMD, weighted mean difference.ICU：重症监护病房（intensive care unit）；MV：机械通气（mechanical ventilation）；VAP：呼吸机相关性肺炎（ventilator-associated pneumonia）；ET：早期气管切开术（early tracheotomy）；LT：晚期气管切开术（late tracheotomy）；PI：延长插管时间（prolonged intubation）；RR：相对危险度（relative risks）；WMD：加权均数差（weighted mean difference）