. 2021 May 5;11:9537. doi: 10.1038/s41598-021-88787-3

Table 1.

Dependence of T_airway on other inspiratory gas temperatures and covariates: univariate and multivariate analyses.

Variables	Regression coefficient
	Mean	95% CI		Wald Chi-square	p
	Mean	Lower	Upper	Wald Chi-square	p
Univariate analysis
Inspiratory gas temperature
T_{tube_centre}	0.929	0.812	1.045	243.68	< 0.001
T_{tube_wall}	1.033	0.921	1.146	324.32	< 0.001
Peak inspiratory pressure
20 cmH₂O	1.236	0.404	2.069	8.47	0.004
15 cmH₂O	0.735	0.157	1.312	6.22	0.013
10 cmH₂O	1.000			Reference
Endotracheal tube cuff
Inflated	-0.523	-1.045	0.000	3.84	0.050
Deflated	1.000			Reference
Inspiratory time
1.0 s	0.120	-0.008	0.247	3.38	0.066
0.5 s	1.000			Reference
Multivariate analysis
Inspiratory gas temperature
T_{tube_centre}	0.643	0.427	0.858	34.17	< 0.001
T_{tube_wall}	0.343	0.132	0.553	10.17	0.001
Endotracheal tube cuff inflated	-0.372	-0.737	-0.007	3.996	0.046

T_airway airway temperature; CI confidence interval; T_{tube_centre} temperature at the centre of the endotracheal tube; and T_{tube_wall} temperature at the wall surface of the endotracheal tube.