Table 2.

Impact of the mechanical device on tracheal cuff pressure

Variables	Continuous control of P cuff	Routine care	p values
	n = 18	n = 18
Mean airway pressure, cmH2O	14 (10–17)	14 (11–16)	0.679
Mean P cuff, cmH2O	25 (18, 28)	21 (18, 26)	0.17
Coefficient of variation of P cuff, %	19 (11, 26)	20 (12, 25)	0.67
P cuff 20–30 cmH2O
Yesa	18 (100)	18 (100)	NA
% of timeb	34 (17, 57)	50 (35, 64)	0.184
P cuff <20, cmH2O
Yesa	17 (94)	18 (100)	>0.999
% of timeb	23 (5, 63)	43 (16, 60)	0.528
P cuff >30, cmH2O
Yesa	18 (100)	16 (89)	0.500
% of timeb	26 (14, 40)	7 (1, 18)	0.002

Data are frequencies (%) or median (interquartile range)

P _cuff cuff pressure, NA not applicable

^aYes indicates the number of patients with at least one P _cuff 20–30, >20, or >30 cmH₂O

^b% of time indicates all the time spent with P _cuff 20–30, >20, or >30 cmH₂O reported to the total recording time during each study period