Table 6. Odds ratios for the pH1N1-HA E374K mutants isolated in Taipei City by multivariate logistic regression analysis.

Factors	Adjusted Odds Ratios (OR) for Mutant E374K versus Wild type E374E	95% CI of OR	p-values
Time
Weeks of the 2009	1.5	1.3, 1.9	<0.001 *
Spatial Cluster
Non-cluster Districts	1
Cluster Districts	4.6	1.0, 20.4	0.047 *
Age (Yers)
≧15	1
0–4.9	0.1	0.0, 4.0	0.224
5–14.9	1.8	0.6, 5.5	0.338
Population density
Low (<20455/km2)	1
High (>20455/km2)	1.4	0.4, 5.5	0.610

Abbreviation : CI, confidence interval; OR: Odds ratio.

*p<0.05.