Table 3:

Univariate analysis of risk factor association with aspiration.

Demographic	Aspiration	No Aspiration	P value
Endotracheal tube size	8.0 or greater: 41% 7.5 or less: 24%	8.0 or greater: 59% 7.5: 76%	0.008*
Age (in years) [IQR]	61 [53-72]	55 [44-65]	0.0008
Gender (female/male)	F = 24% M = 38%	F = 76% M = 62%	0.03
Intubation length (hours) [IQR]	176 [72-234]	117 [72-184]	0.02
Charlson Comorbidity Index	5.0 ± 3.2	3.3 ± 2.6	< 0.001
APACHE II scores	21.3 ± 9.4	19.6 ± 8.2	0.18
Body Mass Index (BMI)	30.3 ± 11.3	31.1 ± 12.2	0.66

IQR = Interquartile range

^*The p-value for ETT size indicates that the proportion of people who aspirate is significantly greater if they have an 8.0mm or larger ETT as compared to the proportion of people who aspirate if they have a 7.5mm or smaller ETT.