Table 3.

Predictors of influenza according to different types of influenza in adult patients admitted to medical wards and ICUs, Toronto, 2007/8 influenza season

Predictor	Influenza A(H3N2)		Influenza B
	Odds ratio (95% CI)		Odds ratio (95% CI)
	Univariable analysis	Multivariable analysis	Univariable analysis	Multivariable analysis
Age ≥65 years	1.3 (0.7–2.3)		1.5 (1.0–2.3)	1.4 (0.9–2.1)
Female gender	0.9 (0.6–1.5)		1.1 (0.8–1.6)
Residence in long-term care facility	1.1 (0.5–2.2)		1.3 (0.8–2.1)
Triage temperature ≥38.0°C	5.5 (3.4–9.0)	4.8 (2.8–8.0)	3.6 (2.5–5.1)	3.0 (2.1–4.5)
Respiratory symptoms in ED	2.4 (1.4–4.3)	1.8 (1.0–3.4)	3.0 (2.0–4.6)	1.8 (1.1–3.0)
Admission diagnosis
Pneumonia/other respiratory infection	2.5 (1.5–4.1)	1.2 (0.7–2.1)	2.6 (1.8–3.7)	1.7 (1.1–2.6)
COPD/asthma/respiratory failure NOS	1.6 (0.8–3.2)		2.2 (1.4–3.5)	2.2 (1.3–3.8)
ICU admission	0.5 (0.3–0.8)		0.7 (0.5–1.0)
Week with >15% specimens positive	6.0 (3.2–11.5)	6.5 (3.3–12.7)	7.5 (4.6–12.2)	7.0 (4.3–11.4)

Abbreviations: ED: emergency department; COPD: chronic obstructive pulmonary disease; NOS: not otherwise specified