Risk Factors for Mortality among 2009 A/H1N1 Influenza Hospitalizations in Maricopa County, Arizona, April 2009 to March 2010

Table 5

Final logistic regression model of risk of death based on A/H1N1 hospitalizations and obtained via backward elimination procedure.

Risk factors	𝑃 value	OR (95% CI)^a
Age groups
<18 y	0.004	0.27 (0.11, 0.66)
18–49 y	0.83	1.1 (0.47, 2.6)
≥50 y	Ref value	1
Ethnicity/race
Unknown	0.99	0
Hispanics	0.24	1.65 (0.72, 3.8)
Native American	0.75	1.24 (0.33, 4.7)
Non-Hispanic black	0.54	0.67 (0.20, 2.4)
Asian	0.008	23.3 (2.3, 238.3)
Non-Hispanic white	Ref value	1
Pandemic wave
Fall wave	0.001	3.94 (1.72, 9.03)
Chronic lung disease	0.001	3.5 (1.66, 7.4)
Cancer within last 12 months	0.02	4.3 (1.3, 14.8)
Immune suppression	0.001	4.0 (1.84, 8.9)
Admission delay	<0.001	4.6 (2.2, 9.5)

^aRisk of death among A/H1N1 inpatients. The corresponding Hosmer-Lemeshow test statistic for model fit (𝑃=0.48) and the Cox and Snell 𝑅²=0.22.