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

Lower

Upper

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

* = p < 0.05 ** = p < 0.01

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