Table 5 Multivariate analysis of risk factors of complicated EV71 disease (grade 2 to 4)

Age <1 year

2.57

0.87 - 7.62

0.09

Sex (Male)

0.99

0.86 - 1.15s

0.92

Skin rash

0.29

0.05 - 1.54

0.15

Fever ^a

5.63

1.74 - 18.28

0.001

Oral ulcer

1.91

0.31 - 11.74

0.48

Day of illness on sampling (day)

1.05^b

0.84 - 1.31

0.66

Viremia

1.26

0.61 - 2.59

0.54