Table 1.

Factors associated with the presence of Anopheles larvae and the Anopheles larval densities in the open water collections recorded in 45 studied areas in Dakar in October-September 2007 and between July 2008 and April 2010.

	Presence of Anopheles larvae			Anopheles larval density
	OR	95% CI	p-value	IRR	95% CI	p-value
	2 273 observations		< 0.0001	852 observations		< 0.0001
Water temperature
< 30°C				1
> = 30°C				1.15	1.02 - 1.30	0.026
pH
< 8	1			1
> = 8	1.79	1.35 - 2.37	< 0.0001	1.31	1.15 - 1.49	< 0.0001
Presence of larvivorous fishes
No	1			1
Yes	0.52	0.34 - 0.83	0.006	0.70	0.55 - 0.89	0.003
Season
Dry (Nov to Jun)	1			1
Wet (Jul to Oct)	2.94	2.20 - 3.92	< 0.0001	1.35	1.15 - 1.59	< 0.0001
Surface vegetation (%)
< 20%	1
> = 20%	2.34	1.67 - 3.29	< 0.0001
Persistence of water collection
Permanent	1
Temporary	7.21	3.83-13.58	< 0.0001
Water collection located in highly urbanized area
No	1
Yes	0.05	0.02 - 0.19	< 0.0001

Logistic regression and binomial negative regression with water collection random effect. Multivariate analysis.