Table 3. Population characteristics and risk factors for dengue in Brownsville, Texas, and Matamoros, Mexico, 2004.
| Risk factor | Brownsville, % | Matamoros, % | p value* |
|---|---|---|---|
| Piped water | 98 | 98 | 1.000 |
| Buy water | 95 | 99.7 | <0.001 |
| Sewerage | 91 | 88 | 0.495 |
| Street drainage | 82 | 48 | <0.001 |
| Store water | 4 | 34 | <0.001 |
| Screens present | 76 | 64 | 0.009 |
| Intact screens | 40 | 32 | 0.054 |
| Air-conditioning (room and central) | 83 | 32 | <0.001 |
| Discarded tires | 44 | 20 | <0.001 |
| Larval habitat | 88 | 92 | 0.284 |
| Mosquito larvae present | 31 | 30 | 0.764 |
| Crossed border (1 mo) | 54 | 38 | <0.001 |
| Crossed border (3 mo) | 66 | 45 | <0.001 |
| Median household weekly income ($ US) | 300 | 100 | <0.001 |
| Mean persons/household | 3.9 | 4.2 | 0.028 |
| Mean hours/day at home | 18.3 | 19.4 | 0.022 |
*Probability values of variables with percentages by adjusted Wald test; the remainder by 2-sample Wilcoxon-Mann-Whitney rank-sum test.