Table 1.

Baseline characteristics of the cohort

Characteristics	Recent ED visit	No recent ED visit	p-value
Number	137	167
Age in years (mean ± SD)	2.3 ± 1.6	2.4 ± 1.6	NS
Sex: Male (%)	66 (48)	92 (55)	NS
≥ 1 dose of influenza vaccine (%)	42 (30.6)	51 (30.5)	NS
Daycare attendance (%)	77 (56.2)	99 (59.3)	NS
At least one sibling (%)	88 (64.2)	103 (61.7)	NS
At least one sibling in daycare (%)	24 (17.5)	36 (21.6)	NS
Exposed to passive smoking (%)	20 (14.6)	20 (12)	NS
Intrafamilial infectious contact (%)	2 (1.5)	6 (3.6)	NS

ED: Emergency Department