Habitat characterization and spatial distribution of Anopheles sp. mosquito larvae in Dar es Salaam (Tanzania) during an extended dry period

Table 3 Output of logistic regression model with presence versus absence of Anopheles sp. larvae as outcome and ecological parameters as explanatory variables.

Variable		Odds Ratio	95% Confidence Interval for OR		P-Value
Variable			Lower	Upper	P-Value
Type of breeding site	Other	1
	Large drain	.145	.046	.459	.001**
	Small drain	.492	.111	2.188	.352
	Swamp	.139	.055	.346	.000**
	Puddle	.196	.051	.752	.018*
	Artificial hole	.481	.186	1.245	.132
	Concrete hole	1.407	.156	12.702	.761
General surrounding
	High density housing	1			.118
	Other	.812	.210	3.131	.762
	Industry	.211	.055	.808	.023*
	Fields	.502	.207	1.216	.127
Distance to nearest inhabited house
	<10 m	1
	10–100 m	1.889	.473	7.541	.368
	>100 m	1.839	.940	3.596	.075
*Culicine* density
	high	1
	low	.856	.369	1.988	.718
	absent	.687	.356	1.328	.265
Size of site
	Perimeter > 10 m	1
	Perimeter 1–10 m	1.932	.928	4.020	.078
	Perimeter < 1 m	22.825	2.094	248.843	.009**
Turbidity of water
	clear	1
	turbid	.469	.231	.954	.037*
	very turbid	.167	.059	.473	.001**
Salinity measured by conductivity [mS/cm] (Quartiles)
	2.6–20.0	1
	1.7–2.5	.522	.228	1.195	.124
	1.1–1.6	1.418	.576	3.490	.447
	0.1–1.0	.728	.313	1.696	.462
Temperature (°C) (Quartiles)
	25.1–29.2	1
	29.3–31.3	1.758	.676	4.571	.247
	31.4–33.4	.731	.306	1.744	.480
	33.5–40.0	1.148	.507	2.597	.741
pH of water (Quartiles)	8.1–10.1	1
	7.7–8.0	1.773	.711	4.426	.220
	7.4–7.6	.825	.330	2.059	.680
	6.1–7.3	.439	.180	1.070	.070
Predators present		1.931	1.031	3.619	.040*
Sun-lit (less than 50% of surface shaded)		1.913	.575	6.363	.290
Depth >0.5 m		.750	.393	1.434	.384
Grass present		.952	.601	1.508	.834
Floating vegetation present		.935	.570	1.534	.790
Submersed vegetation present		1.201	.679	2.124	.529

ISSN: 1475-2875