Table 3.

Multivariate analysis for risk factors of EV71 viremia

	Odds ratio	95% CI	pvalue
Age <1 year	4.27	1.45 - 12.59	0.008
Sex (Male)	0.98	0.82 - 1.18	0.84
Skin rash	0.70	0.21 - 2.40	0.57
Fever a	7.81	0.40 - 152.76	0.18
Oral ulcer	0.34	0.02- 5.48	0.45
Grade 2 to 4 EV71 disease	1.16	0.54 - 2.47	0.70
Day of illness on sampling (day)	0.39b	0.28 - 0.54	<0.001

^aFever was defined as any body temperature over 38 degrees Celsius.

^bThe value represents the change in odds ratio per day after disease onset.