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.

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