Volume 18, Number 11—November 2012
Research
Litchi–associated Acute Encephalitis in Children, Northern Vietnam, 2004–2009
Juliette Paireau, Nguyen Hai Tuan, Rémi Lefrançois, Matthew R. Buckwalter, Ngu Duy Nghia, Nguyen Tran Hien, Olivier Lortholary, Sylvain Poirée, Jean-Claude Manuguerra, Antoine Gessain, Matthew L. Albert, Paul T. Brey, Phan Thi Nga, and Arnaud Fontanet
Table 3
Multivariate analysis of Ac Mong encephalitis, Bac Giang Province, Vietnam, 2004–2009
| Variable/category | IRR* (95% CI) | p value† |
|---|---|---|
| Litchi surface, % commune surface | ||
|
<1.49 |
1 | <0.001 |
|
1.49–5.84 |
1.52 (0.90–2.57) | |
|
5.84–12.92 |
2.94 (1.88–4.60) | |
|
>12.92 |
2.76 (1.76–4.32) | |
| Poultry density, no./km2 | ||
|
<1,449.79 |
1 | <0.001 |
|
1,449.79–3,715.18 |
0.62 (0.43–0.91) | |
|
3,715.18–7,065.25 |
0.61 (0.42–0.89) | |
|
>7,065.25 |
0.25 (0.15–0.43) | |
| Mean humidity, %, January–April | ||
|
<82.07 |
1 | <0.001 |
|
82.07–83.55 |
0.84 (0.61–1.16) | |
|
>83.55 |
0.35 (0.23–0.54) |
*IRR, incidence rate ratio.
†Indicates global p value.
