Table 2. Proportion of influenza A pH1N1 2009 seropositive individuals, listed by variable.

Variable	Positive Serology, Number (%)	OR unadjusted (IC95%)	OR adjusted (IC95%)**
Place of Work
ER	28/76 (36.8)	3.40 (1.27−9.10)	4.14 (1.24−13.86)
OR	6/41 (14.6)	1.00	1.00
2009 Seasonal Vaccine
No	10/26 (38.5)	1.69 (0.68−4.24)	3.02 (1.02−8.92)
Yes	24/89 (27.0)	1.00	1.00
Hand Washing
Poor or never	8/18 (44.4)	2.19 (0.79−6.14)	2.52 (0.74−8.64)
Always	26/97 (26.8)	1.00	1.00
Use of masks
Poor or never	21/53 (39.6)	2.37 (1.04−5.41)	1.21 (0.43−3.36)
Always	13/60 (21.7)	1.00	1.00

** Model included the four variables listed.