Table 4 Negative binomial regression model for hospital LOS and ICU LOS

ICU Return vs. No ICU Return

2.187 (1.876–2.549)

3.307 (2.767–3.952)

Female vs. Male

0.946 (0.807–1.109)

1.013 (0.845–1.215)

Urgent/Emergent vs. Elective Admission

1.058 (0.865–1.293)

1.080 (0.854–1.366)

Trauma vs. Elective Admission

1.346 (1.019–1.778)

1.417 (1.033–1.945)

Surgical vs. Medical Admission

1.229 (1.039–1.455)

1.503 (1.237–1.826)

First RI Score

0.993 (0.989–0.996)

0.986 (0.982–0.990)

Age (Years)

0.989 (0.983–0.994)

0.991 (0.985–0.998)

COVID-19 Positive

1.254 (0.891–1.765)

1.640 (1.132–2.375)

Charlson Comorbidity Index

1.013 (0.977–1.051)

1.011 (0.970–1.054)