Table 4 Bivariate logistic regression results for presence of An. arabiensis larvae: water body characteristics
Dongola | Merowe | |||||||
|---|---|---|---|---|---|---|---|---|
Habitats sampled | OR* | 95% CI | P value† | Habitats sampled | OR | 95% CI | P value† | |
Water temperature (°C) | 0.26 | 0.87 | ||||||
<24 | 366 | 1.00 | 533 | 1.00 | ||||
24–27.9 | 281 | 1.01 | 0.63–1.63 | 0.95 | 400 | 1.10 | 0.68–1.79 | 0.70 |
28–31.9 | 376 | 0.76 | 0.47–1.20 | 0.24 | 569 | 1.11 | 0.71–1.74 | 0.63 |
32+ | 258 | 1.23 | 0.77–1.96 | 0.38 | 565 | 1.23 | 0.79–1.90 | 0.35 |
Salinity (%) | <0.0001 | <0.0001 | ||||||
0 | 318 | 1.00 | 890 | 1.00 | ||||
0.01–0.25 | 689 | 5.02 | 2.66–9.48 | <0.0001 | 807 | 2.88 | 1.95–4.26 | <0.0001 |
>0.25 | 274 | 4.49 | 2.25–8.98 | <0.0001 | 370 | 2.49 | 1.56–3.99 | <0.0001 |
pH | <0.0001 | 0.0005 | ||||||
< 6.5 | 253 | 1.00 | 424 | 1.00 | ||||
6.5 | 756 | 1.00 | 0.62–1.63 | 0.99 | 1,358 | 1.05 | 0.68–1.61 | 0.83 |
> 6.5 | 272 | 2.59 | 1.55–4.31 | <0.0001 | 285 | 2.29 | 1.39–3.78 | 0.001 |
Water turbidity | 0.54 | 0.0002 | ||||||
Non-turbid | 871 | 1.00 | 1,141 | 1.00 | ||||
Turbid | 410 | 0.89 | 0.62–1.29 | 926 | 0.53 | 0.38–0.75 | ||
Water depth (cm) | 0.20 | <0.0001 | ||||||
<10 | 844 | 1.00 | 1,148 | 1.00 | ||||
10–50 | 325 | 0.94 | 0.64–1.39 | 0.76 | 418 | 1.39 | 0.97–1.99 | 0.07 |
>50 | 112 | 0.53 | 0.25–1.12 | 0.10 | 501 | 0.32 | 0.18–0.55 | <0.0001 |
Surface area (m 2 ) | 0.0001 | <0.0001 | ||||||
<1 | 552 | 1.00 | 947 | 1.00 | ||||
1–10 | 438 | 1.97 | 1.36–2.86 | <0.0001 | 619 | 3.86 | 2.62–5.68 | <0.0001 |
>10 | 291 | 0.79 | 0.48–1.32 | 0.37 | 501 | 1.81 | 1.14–2.87 | 0.01 |
Degree of shading (%) | 0.0008 | <0.0001 | ||||||
<25 | 888 | 1.00 | 1,290 | 1.00 | ||||
25–75 | 285 | 0.56 | 0.35–0.89 | 0.01 | 546 | 0.67 | 0.45–0.97 | 0.04 |
>75 | 108 | 0.29 | 0.12–0.73 | 0.01 | 231 | 0.12 | 0.04–0.38 | <0.0001 |
Presence of algae | <0.0001 | <0.0001 | ||||||
No | 1,027 | 1.00 | 1,701 | 1.00 | ||||
Yes | 254 | 3.62 | 2.54–5.17 | 366 | 5.81 | 4.18–8.07 | ||
Presence of vegetation | <0.0001 | <0.0001 | ||||||
No | 598 | 1.00 | 1,042 | 1.00 | ||||
Yes | 683 | 2.18 | 1.52–3.13 | 1,025 | 2.27 | 1.62–3.17 | ||