Table 2. Results of multivariate analysis of potential risk factors for human infection with avian influenza A H5N1, Vietnam, 2004*.

Exposure and characteristics	Odds ratio	95% CI	p value
Prepare and cook sick or dead poultry	8.99	0.98–81.99	0.052
Sick or dead poultry in household	4.94	1.21–20.20	0.026
No indoor water source in household	6.46	1.20–34.81	0.03

*Conditional logistic regression; final model with 3 variables entered; χ² for likelihood ratio test = 28.35; p<0.001; no. observations = 134; CI, confidence interval.