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Volume 18, Number 11—November 2012
Research
Seroprevalence of Antibodies against Chikungunya, Dengue, and Rift Valley Fever Viruses after Febrile Illness Outbreak, Madagascar
Norbert G. Schwarz1
, Mirko Girmann1, Njary Randriamampionona, Alexandra Bialonski, Deborah Maus, Anne Caroline Krefis, Christine Njarasoa, Jeanne Fleury Rajanalison, Herly Daniel Ramandrisoa, Maurice Lucien Randriarison, Jürgen May, Jonas Schmidt-Chanasit, and Raphael Rakotozandrindrainy
, Mirko Girmann1, Njary Randriamampionona, Alexandra Bialonski, Deborah Maus, Anne Caroline Krefis, Christine Njarasoa, Jeanne Fleury Rajanalison, Herly Daniel Ramandrisoa, Maurice Lucien Randriarison, Jürgen May, Jonas Schmidt-Chanasit, and Raphael Rakotozandrindrainy
Table 3
Protective or risk factors for CHIKV infection in pregnant women from 2 coastal locations Mananjary (N = 195) and Manakara (N = 251), Madagascar, May–July 2010*
| Factor | No. women |
Bivariable analysis, n = 446
|
Multivariable model 1, n = 433
|
Multivariable model 2, n = 376
|
|||||
|---|---|---|---|---|---|---|---|---|---|
| OR (95% CI)† | p value | OR (95% CI) | p value | OR (95% CI) | p value | ||||
| Bednet use | |||||||||
|
No |
40 | Reference | 0.70 | Reference | 0.98 | Reference | 0.95 | ||
|
Yes |
400 | 0.87 (0.44–1.73) | 0.99 (0.47–2.06) | 1.02 (0.47–2.22) | |||||
| Parity | |||||||||
|
Multipara |
324 | Reference | 0.93 | Reference | 0.44 | Reference | 0.65 | ||
|
Primipara |
122 | 0.98 (0.63–1.53) | 0.79 (0.43–1.44) | 0.86 (0.44–1.67) | |||||
| Age, y | |||||||||
|
<20 |
94 | Reference | 0.67† | Reference | 0.17 | Reference | 0.37 | ||
|
20–30 |
225 | 0.82 (0.49–1.36) | 0.70 (0.36–1.34) | 0.81 (0.39–1.69) | |||||
|
>30 |
125 | 0.87 (0.49–1.53) | 0.57 (0.26–1.23) | 0.68 (0.29–1.60) | |||||
| Weight, kg | |||||||||
|
<40 |
17 | Reference | 0.001† | Reference | 0.0006 | Reference | 0.001 | ||
|
40–49 |
242 | 1.22 (0.38–3.87) | 1.22 (0.38–3.92) | 1.45 (0.39–5.45) | |||||
|
50–59 |
142 | 1.82 (0.56–5.88) | 1.86 (0.57–6.08) | 2.36 (0.61–9.09) | |||||
|
60–70 |
32 | 2.53 (0.67–9.47) | 2.84 0.74–10.8 | 3.82 (0.85–17.2) | |||||
|
>70 |
8 | 9.75 (1.38–68.8) | 10.8 (1.52–77.2) | 11.4 (1.39–93.0) | |||||
| Trimester | |||||||||
|
1st |
9 | Reference | 0.45 | Reference | 0.39‡ | ||||
|
2nd |
142 | 0.37 (0.10–1.45) | 0.44 (0.10–1.90) | ||||||
|
3rd |
236 | 0.36 (0.10–1.40) | 0.40 (0.10–1.71) | ||||||
*CHIKV, chikungunya virus; OR, odds ratio.
†Nonparametric test of trend.
‡Mantel-Haenszel test for trend, adjusted for the other variables.
1These authors contributed equally to this article.
- Page created: October 15, 2012
- Page last updated: October 15, 2012
- Page last reviewed: October 15, 2012
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