Table 4.

Odds Ratios and Confidence Intervals for Hospital Length of Stay, Intensive Care Unit Admission, and Invasive Mechanical Ventilation by Body Mass Index Category Among Adults Hospitalized With Community-Acquired Pneumonia Adjusted for Demographics, Select Chronic Conditions, and Etiology^a

Outcome	BMI Category	Adjustedb			Adjusted With Etiologyc
		% With Outcome (n = 2285)	OR (95% CI)	P Value	% With Outcome (n = 2224)	OR (95% CI)	P Value
Hospital length of stay >3 d
	Underweight	59	1.59 (1.05–2.42)	.03	59	1.65 (1.08–2.53)	.02
	Normal	48	ref		47	ref
	Overweight	48	0.97 (.78–1.21)	.80	48	1.00 (.80–1.26)	.97
	Obesity	46	0.96 (.77–1.20)	.73	46	0.99 (.78–1.25)	.93
	Extreme obesity	52	1.31 (.95–1.80)	.10	51	1.36 (.98–1.88)	.07
Intensive care unit admission
	Underweight	26	1.29 (.80–2.06)	.29	26	1.27 (.78–2.06)	.34
	Normal	23	ref		23	ref
	Overweight	19	0.80 (.61–1.04)	.10	19	0.80 (.61–1.07)	.13
	Obesity	22	0.96 (.73–1.25)	.74	22	0.97 (.74–1.29)	.86
	Extreme obesity	19	0.87 (.58–1.29)	.48	19	0.91 (.60–1.36)	.63
Invasive mechanical ventilation
	Underweight	9	1.43 (.69–2.98)	.34	8	1.32 (.60–2.91)	.49
	Normal	7	ref		7	ref
	Overweight	4	0.51 (.31–.85)	.009	4	0.52 (.31–.88)	.02
	Obesity	5	0.73 (.45–1.18)	.20	5	0.74 (.45–1.22)	.24
	Extreme obesity	4	0.69 (.33–1.43)	.32	4	0.78 (.37–1.65)	.52

Abbreviations: BMI, body mass index; CI, confidence interval; OR, odds ratio.

^aAll comparisons were with the normal weight category.

^bAdjusted adult logistic regression models were controlled for age group, sex, race/ethnicity, enrollment city, history of asthma, heart disease, immunosuppression, cancer (excluding dermatological malignancies), neurological conditions, chronic obstructive pulmonary disease, diabetes, and current smoking status.

^cAdjusted models with etiology were adjusted for all the factors mentioned above as well as for the presence or absence of bacterial, atypical bacterial (Mycoplasma pneumoniae, Chlamydophila pneumoniae, and Legionella species), or viral etiology.