Table 4.
Univariate analysis of household and environmental risk factors and dengue infection
| Total number subjects* | Past dengue infection | Recent dengue infection | |||||||
|---|---|---|---|---|---|---|---|---|---|
| n (%) | Crude OR | 95% Confidence interval | P value | n (%) | Crude OR | 95% Confidence interval | P value | ||
| Water storage at home (N = 1,993) | |||||||||
| No | 175 | 125 (71.4) | 1 | − | − | 11 (6.3) | 1 | − | − |
| Yes | 1,818 | 1,420 (78.1) | 1.42 | 1.00–2.00 | 0.044 | 190 (10.5) | 1.74 | 0.93–3.26 | 0.084 |
| Water storage in tanks (N = 1,993) | |||||||||
| No | 428 | 334 (78.0) | 1 | − | − | 36 (8.4) | 1 | − | − |
| Yes | 1,565 | 1,211 (77.4) | 0.96 | 0.74–1.25 | 0.773 | 165 (10.5) | 1.28 | 0.88–1.87 | 0.195 |
| Water storage in containers (N = 1,993) | |||||||||
| No | 871 | 647 (74.3) | 1 | − | − | 75 (8.6) | 1 | − | − |
| Yes | 1,122 | 898 (80.0) | 1.39 | 1.12–1.71 | 0.002† | 126 (11.2) | 1.34 | 0.99–1.81 | 0.055 |
| Trash disposal | |||||||||
| Collected by public services (N = 1,993) | |||||||||
| No | 435 | 333 (76.6) | 1 | − | − | 45 (10.3) | 1 | − | − |
| Yes | 1,558 | 1,212 (77.8) | 1.07 | 0.83–1.38 | 0.584 | 156 (10.0) | 0.96 | 0.68–1.37 | 0.839 |
| On grounds of the house (N = 1,993) | |||||||||
| No | 1,961 | 1,519 (77.5) | 1 | − | − | 201 (10.2) | − | − | − |
| Yes | 32 | 26 (81.2) | 1.26 | 0.52–3.08 | 0.611 | 0 | − | − | 0.068‡ |
| Potential mosquito breeding sites | |||||||||
| Litter outdoors (N = 1,993) | |||||||||
| No | 1,194 | 939 (78.6) | 1 | − | − | 119 (10.0) | 1 | − | − |
| Yes | 799 | 606 (75.8) | 0.85 | 0.69–1.06 | 0.143 | 82 (10.3) | 1.03 | 0.83–1.39 | 0.830 |
| Car tires outdoors (N = 1,993) | |||||||||
| No | 1,791 | 1,386 (77.4) | 1 | − | − | 172 (9.6) | 1 | − | − |
| Yes | 202 | 159 (78.7) | 1.08 | 0.76–1.54 | 0.669 | 29 (14.4) | 1.58 | 1.03–2.41 | 0.035† |
| Bottles outdoor (N = 1,993) | |||||||||
| No | 1,296 | 1,004 (77.5) | 1 | − | − | 131 (10.1) | 1 | − | − |
| Yes | 697 | 541 (77.6) | 1.01 | 0.81–1.26 | 0.939 | 70 (10.0) | 0.99 | 0.73–1.35 | 0.963 |
| Indoor flower vases (N = 1,994) | |||||||||
| No | 873 | 667 (76.4) | 1 | − | − | 79 (9.0) | 1 | − | − |
| Yes | 1,120 | 878 (78.4) | 1.12 | 0.91–1.38 | 0.291 | 122 (10.9) | 1.23 | 0.91–1.66 | 0.176 |
*
Total number of subjects is the denominator for each variable category. The univariate analysis for the two outcome variables is presented as in Table 2.
†
P values that remained or became significant after adjusting by age group (in the text).
‡
Fisher's exact test.