4.

机械通气时间延长组和非延长组相关指标的比较

The univariate analysis of risk factors between PMV group and SMVgroup

Variable	SMV group (n=24)	PMV group (n=38)	P
SMV, shortened mechanical ventilation; PMV, prolonged mechanical ventilation. Other abbreviations as in Table 1.
Age/years, x±s	47±16	50±18	0.517
ISS, median (P25, P75)	29 (21, 37)	36 (29, 50)	0.022
GCS, median (P25, P75)	14 (12, 15)	8 (3, 12)	0.029
Ventilatory time/d, median (P25, P75)	5 (2, 6)	16 (9, 20)	< 0.001
Length of hospital stay/d, median (P25, P75)	14 (8, 16)	24 (18, 42)	< 0.001