Table 4.

Sensitivity analysis: adjusted measures of association based on full cohort

	OR (95% CI)	P value
Empyema	1.35 (0.58 to 3.16)	0.49
Pneumonia	1.54 (0.97 to 2.46)	0.07
Death	0.9 (0.45 to 1.81)	0.78
Pneumonia or death	1.31 (0.76 to 2.25)	0.32
Clostridium difficile colitis	0.58 (0.24 to 1.41)	0.23

	Rate ratio (95% CI)	P value
ICULOS	1.34 (1.17 to 1.54)	<0.0001
Hospital LOS	1.14 (1.05 to 1.23)	0.0019
Ventilation days	1.33 (1.01 to 1.75)	0.042

Adjusted estimates of marginal ORs and rate ratios based on generalized estimating equations fitted on the full cohort, with each trauma center treated as a cluster. CIs and p values were based on the robust SE.

ICULOS, intensive care unit length of stay.