Table 2.

Univariate analysis

Main outcome	Frail n = 67	Not frail n = 32		P value †
Duration of MV (days), median [25%, 75%]				<0.01
In all patients	8 [6, 19]	5 [3, 9]		0.10
In patients who tracheostomy performed	7 [4, 8]	5 [3, 7]		0.90
In patients who tracheostomy did not performed	23 [18, 46]	22 [21, 31]

Secondary outcomes	Frail n = 67	Not frail n = 32	Odds ratio (95% CI)	P value †
In‐hospital death, n (%)	18 (27)	6 (19)	1.58 (0.52‐5.49)	0.46
CFS 1–3		6/32 (19)
CFS 4	8/29 (28)
CFS 5–6	7/30 (23)
CFS 7–8	3/8 (38)
Discharge to home, n (%)	12 (18)	13 (41)	0.32 (0.11‐0.91)	0.02
Successful weaning, n (%)	40 (60)	25 (78)	0.42 (0.13‐1.18)	0.11
Nonweaning, n (%)	12 (18)	5 (16)	1.18 (0.34‐4.71)	>0.99
Duration until the first SA (days), median [25%, 75%]	6 [4, 8]	5 [3, 7]		0.27
Reintubation rate in attempted extubation only, n (%)	11 (22)	6 (22)	1.01 (0.29‐3.84)	>0.99
Tracheostomy, n (%)	22 (33)	3 (9)	4.66 (1.23‐26.51)	0.01

CFS, Clinical Frailty Scale; CI, confidence interval; MV, mechanical ventilation; SA, separation attempt.

^†We used Fisher’s exact test as categorical variables and Mann–Whitney U test as continuous variables.