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

Table 4 Output of logistic regression model with high versus low Anopheles sp. larvaedensity as outcome and ecological parameters as explanatory variable.

Variable		Odds Ratio	95% Confidence Interval for OR		P-Value
Variable		Odds Ratio	Lower	Upper	P-Value
Type of breeding site
	other	1
	large drain	.124	.021	.739	.022*
	small drain	.768	.109	5.389	.791
	swamp	.182	.053	.629	.007**
	puddle	.165	.033	.832	.029*
	artificial hole	.712	.198	2.556	.602
	concrete hole	.348	.032	3.727	.383
General surrounding
	high density housing	1
	other	.358	.056	2.290	.278
	industry	2.675	.326	21.950	.359
	fields	.925	.275	3.112	.899
Distance to nearest inhabited house
	<10 m	1
	10–100 m	.658	.261	1.656	.374
	>100 m	.409	.054	3.069	.384
*Cuttcine* density
	high density	1
	low density	.728	.221	2.396	.602
	absent	1.078	.432	2.688	.872
Size of site
	perimeter > 10 m	1
	perimeter 1–10 m	1.565	.576	4.255	.380
	perimeter < 1 m	.907	.166	4.950	.911
Turbidity of water
	clear water	1
	turbid water	1.653	.692	3.951	.258
	very turbid water	2.116	.372	12.030	.398
Salinity measured by conductivity [mS/cm] (Quartiles)
	2.7–20.0	1
	1.7–2.6	1.638	.479	5.599	.431
	1.2–1.6	.818	.251	2.671	.740
	0.1–1.1	.687	.227	2.079	.507
Temperature (°C)(Quartiles)
	34.1–40.0	1
	31.6–34.0	1.004	.315	3.203	.994
	29.4–31.5	1.312	.356	4.830	.683
	25.1–29.3	.619	.176	2.184	.456
pH of water (Quartiles)
	8.2–10.1	1
	7.8–8.1	.882	.228	3.419	.856
	7.5–7.7	.777	.200	3.027	.716
	6.5–7.4	.793	.198	3.182	.744
Predators present		1.322	.530	3.302	.550
Sun-lit (less than 50% of surface shaded)		1.035	.184	5.832	.969
Depth >0.5 m		.460	.174	1.219	.118
Grass present		.801	.272	2.362	.688
Floating vegetation present		.352	.130	.952	.040*
Submersed vegetation present		1.745	.725	4.197	.214

ISSN: 1475-2875