Table 3. Sensitive analysis of association of OASIS with hospital mortality, ICU mortality, and 28-day mortality.

Outcomes	OR/HR	95% CI	p
Hospital mortality
Non-adjusted	1.04	[1.02–1.05]	<0.001
Adjusted	1.03	[1.01–1.05]	<0.001
ICU mortality
Non-adjusted	1.04	[1.03–1.06]	<0.001
Adjusted	1.02	[1.00–1.04]	0.064
28-day mortality
Non-adjusted	1.03	[1.02–1.04]	<0.001
Adjusted	1.03	[1.01–1.04]	<0.001

Notes:

Only patients diagnosed as sepsis according to ICD-9 codes were included into the sensitive analysis. Associations of OASIS with hospital mortality and ICU mortality were analyzed using logistic regression models. Association of OASIS with 28-day mortality was analyzed using Cox regression models. Model was adjusted for age, admission type, ethnicity, mechanical ventilation on first day, renal replacement therapy on first day, and the Elixhauser Comorbidity Index (SID30). Statistical significance (p < 0.05) is shown in bold.

OASIS, Oxford Acute Severity of Illness Score; ICU, intensive care unit; OR, odds ratio; HR, hazard ratio; CI, confidence interval.