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Table 4 Analysis of factors associated to DENV-4 cases in Rio de Janeiro, Brazil, from January 2011 to December 2013

From: Dengue type 4 in Rio de Janeiro, Brazil: case characterization following its introduction in an endemic region

Ā 

Dengue

p value*

DWAS

p value*

Severe dengue

p value*

n

%

n

%

n

%

Age group (years)

ā€ƒĀ ā‰¤Ā 15

102

85.0

Ā 

15

12.5

Ā 

3

2.5

>0.05

ā€ƒ16ā€“64

426

83.8

>0.05

67

13.1

>0.05

15

2.9

ā€ƒĀ >Ā 65

20

83.3

Ā 

1

4.1

Ā 

3

12.5

Type of infection

ā€ƒPrimary

159

48.6

>0.05

43

50.5

>0.05

5

31.2

>0.05

ā€ƒSecondary

168

51.4

42

49.5

11

68.8

  1. *Statistical analysis performed for the comparison of the disease severity to the distinct age groups and type of infection