. 2021 Jul 16;50(1):e1–e10. doi: 10.1097/CCM.0000000000005216

TABLE 3.

Clinical Outcomes of the Four Cohorts and Odds Ratios of Inhospital Mortality of Body Mass Index Categories in the Multivariable Logistic Regression Model, With Body Mass Index 18.5–25 kg/m² Used As Reference Category

Outcomes	Coronavirus Disease 2019(n = 2,635)	Nonsevere Acute Respiratory Syndrome Coronavirus 2 Viral Pneumonia (n = 2,940)	Bacterial Pneumonia (n = 14,250)	Trauma (n = 15,681)	p
LOS ICU of survived patients, d	18 (10–33)	4 (2–8)^a	3 (2–7)^a	1 (1–3)^a	< 0.001
LOS ICU deceased patients, d	10 (5–18)	5 (2–9)^a	4 (1–8)^a	2 (1–6)^a	< 0.001
LOS hospital of survived patients, d	31 (19–46)	11 (7–18)^a	12 (7–20)^a	9 (5–16)^a	< 0.001
LOS hospital of deceased patients, d	12 (6–19)	7 (3–13)^a	7 (3–13)^a	5 (2–10)^a	< 0.001
Number of readmissions	11 (0.4)	48 (1.6)^a	1,348 (8.6)^a	238 (1.5)^a	< 0.001
28-d mortality, n (%)	660 (25.0)	507 (17.2)^a	2,858 (20.1)^a	1,394 (8.9)^a	< 0.001
Inhospital mortality, n (%)	769 (29.2)	545 (18.5)^a	3,019 (21.2)^a	1,456 (9.3)^a	< 0.001
Odds ratios, kg/m²
BMI < 18.5	1.92 (0.51–7.13)	1.50 (0.95–2.37)	1.88 (1.57–2.25)	1.23 (0.86–1.78)
BMI 18.5–25	1.0 (reference)	1.0 (reference)	1.0 (reference)	1.0 (reference)
BMI 25–30	0.95 (0.75–1.21)	0.78 (0.61–0.99)	0.78 (0.70–0.86)	0.9 (0.78–1.03)
BMI 30–35	0.87 (0.65–1.16)	0.76 (0.55–1.04)	0.81 (0.70–0.93)	0.99 (0.79–1.23)
BMI ≥ 35	1.15 (0.79–1.67)	0.64 (0.43–0.95)	0.73 (0.61–0.87)	0.81 (0.57–1.15)

BMI = body mass index, LOS = length of stay.

^ap < 0.001 compared with coronavirus disease 2019 using pairwise χ² or Wilcoxon tests.

Covariates used for the multivariable logistic regression analyses included sex, age, medical history (chronic diagnoses), Acute Physiology and Chronic Health Evaluation III Acute Physiology Score, vasoactive medication, mechanical ventilation, and Pao₂/Fio₂ ratio on ICU admission.

Data presented as median (interquartile range) or n (%). p values calculated using χ² tests or Kruskal-Wallis tests across all four cohorts.