Table 3.

Univariate and age-adjusted multivariate logistic regression analysis by cause of reintubation.

	Univariate logistic regression			Multivariate regression (age-adjusted)
	OR	95% CI	p value	OR	95% CI	p value
Reintubation group
Age	0.977	0.944 to 1.011	0.185
APACHE score	1.055	0.986 to 1.129	0.120	1.066	0.996 to 1.141	0.066
Intubation duration	1.128	1.018 to 1.249	0.022	1.123	1.013 to 1.246	0.028
P/F ratio	0.996	0.989 to 1.003	0.228	0.994	0.987 to 1.001	0.105
RSBI	1.034	1.006 to 1.063	0.017	1.033	1.005 to 1.061	0.023
Respiratory insufficiency group
Age	0.995	0.950 to 1.041	0.820
APACHE score	1.062	0.967 to 1.165	0.208	1.068	0.972 to 1.173	0.173
Intubation duration	1.088	0.947 to 1.250	0.232	1.088	0.946 to 1.250	0.236
P/F ratio	0.989	0.980 to 0.999	0.036	0.989	0.979 to 0.999	0.026
RSBI	1.030	0.994 to 1.067	0.106	1.030	0.994 to 1.067	0.108
Nonrespiratory insufficiency group
Age	0.959	0.913 to 1.007	0.092
APACHE score	1.083	0.982 to 1.195	0.111	1.108	0.998 to 1.229	0.054
Intubation duration	1.165	1.012 to 1.342	0.033	1.163	1.004 to 1.348	0.044
P/F ratio	1.004	0.994 to 1.013	0.449	1.002	0.992 to 1.012	0.734
RSBI	1.038	0.998 to 1.080	0.065	1.033	0.994 to 1.074	0.097

APACHE, acute physiology and chronic health evaluation; CI, confidence interval; OR, odds ratio; P/F ratio, pressure of arterial oxygen to fractional inspired oxygen concentration ratio; RSBI, rapid shallow breathing index.