Pandemic influenza 2009: Impact of vaccination coverage on critical illness in children, a Canada and France observational study

Table 3 Critically ill patient-based factors associated with risk of invasive ventilation in Canada

Included variables	n = 157	OR	95%CI	P value
PIM2 > 7.5	39	6.26	2.43-16.4	< 0.001
Age, years < 1	21	1.88	0.51-6.94	0.35
1-4	52	1.50	0.51-4.35	0.46
5-9	46	2.42	0.45-6.93	0.10
> 10	38	1	(Ref)
H1N1 vaccine	32	0.30	0.11-0.83	0.02
Asthma	41	0.23	0.09-0.64	0.004
Lung diseases (not asthma)	22	0.99	0.32-3.08	0.99
Neurologic diseases	31	2.51	0.92-6.90	0.07
Cardiologic diseases	28	1.13	0.43-2.97	0.76
Others diseases	47	0.87	0.37-2.05	0.76
Oseltamivir within 48 h	102	1.02	0.47-2.24	0.95

H1N1 vaccine, children vaccinated against H1N1; lung diseases, chronicle lung diseases without asthma; Neurologic disease, neurologic and muscular disorder; Cardiologic diseases, cardiologic diseases before admission; other diseases, all comorbities without lung, cardiologic or neurologic diseases. OR: Odd ratio; CI: Confidence interval; PIM2: Paediatric index of mortality revised version.