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Volume 9, Number 4—April 2003

Research

Dengue Fever in Travelers to the Tropics, 1998 and 1999

Heidi Lindbäck*†, Johan Lindbäck†, Anders Tegnell†, Ragnhild Janzon†, Sirkka Vene†, and Karl Ekdahl†Comments to Author 
Author affiliations: *Uppsala University, Uppsala, Sweden; †Swedish Institute for Infectious Disease Control, Solna, Sweden

Main Article

Table 3

Odds ratios for diagnosis of dengue fever, calculated for possible risk factors

Risk factor Ratio in cases Ratio in controls Odds ratio 95% CIa
Geographic area




India with neighbors
7/105
7/292
2.91
0.89 to 9.50
Malay Peninsula
79/105
111/292
4.95
2.92 to 8.46
China
0/105
17/292
0.00
0.00 to 0.65
The rest of Asia
3/105
15/292
0.54
0.10 to 1.98
Carribean
4/105
40/292
0.25
0.06 to 0.72
Central America
3/105
17/292
0.48
0.11 to 1.77
South America
1/105
21/292
0.12
0.00 to 0.79
West Africa
0/105
6/292
0.00
0.00 to 2.60
East Africa
1/105
4/292
0.69
0.01 to 7.11
South Africa
0/105
11/292
0.00
0.00 to 1.09
Australia and Pacific Islands
7/105
43/292
0.41
0.15 to 0.97
Age groups (y)




0–14
2/107
14/292
0.38
0.04 to 1.69
15–29
58/107
82/292
3.03
1.87 to 4.92
30–44
33/107
79/292
1.20
0.72 to 2.01
>45
14/107
117/292
0.23
0.12 to 0.43
Sex




Male
54/107
154/292
0.91
0.57 to 1.46
Length of travel (nights)




0–10
0/74
68/292
0.00
0.00 to 0.17
11–17
16/74
149/292
0.26
0.14 to 0.50
18–24
13/74
31/292
1.79
0.83 to 3.82
>25 45/74 44/292 8.75 4.79 to 16.06

aCI, confidence interval.

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