Table 5. Logistic regression of clinical and cytokine level variables.

Variable	crude OR	CIor	ORmodel 1 (IL-6 and respiratory distress)	CIor	ORmodel 2 (IL-6, respiratory distress and increased hematocrit)	CIor
Fever a	1.0	-
Gastrointestinal symptoms	1.2	0.3–4.7
Headache	0.6	0.1–4.1
Myalgia	1.3	0.3–6.8
Respiratory distress a	1.0	-	1.0	-	1.0	-
Infiltrate on chest X-Ray	0.4	0.1–1.8
Blood shift	0.3	0.1–1.6
Atypical lymphocytosis	2.2	0.2–26
Thrombocytopenia	1.5	0.2–10
Increased hematocrit*	3.8	1–14.2			6.9	0.8–54.9
IL-1β	0.4	0.4–5.4
IL-12p70	0.3	0.3–3.0
IL-21	0.5	0.1–2.4
TNF-α	1.6	0.5–5.7
IFN-γ	1.4	0.4–4.8
IL-10	2.0	0.6–6.9
IL-6*	14.4	3.3–63.1	10	1.6–74.7	10.9	1.6–74.7

^a OR not calculated because one or more boxes contain zero.

_* Significant

OR model 1: Stepwise Forward

OR model 2: Stepwise Reverse