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

Lower

Upper

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

* = p < 0.05 ** = p < 0.01

Sattler et al. Malaria Journal 2005 4:4   doi:10.1186/1475-2875-4-4