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The Journal of Basic and Applied Zoology

Table 2 Cox PH model summary of species effect on survival of fingerlings at different pulse exposure duration

From: Survival analysis of African catfish and Nile tilapia briefly exposed to complex pesticide mixtures

Pesticide

Exposure duration (mins)

df

Parameter estimate

SE

Chi-square

Pr > ChiSq

Hazard ratio

Atrazine-Mancozeb

15*

1

.482

.913

.278

.598

1.619

30*

1

1.179

1.155

1.042

.307

3.252

45*

1

1.958

1.081

3.281

.070

7.088

60*

1

.877

.708

1.533

.216

2.404

Atrazine-Chlorpyrifos

15*

1

 − .391

.646

.366

.545

.677

30*

1

 − .300

.557

.291

.590

.741

45*

1

.074

.518

.020

.887

1.077

60*

1

1.817

.574

10.027

.002

6.154

Atrazine-Lambda cyhalothrin

15*

1

 − .363

.913

.158

.691

.695

30*

1

 − .190

.671

.081

.777

.827

45*

1

.670

.572

1.372

.241

1.954

60*

1

.970

.469

4.285

.038

2.639

Mancozeb-Chlorpyrifos

15*

1

.374

.913

.168

.682

1.454

30*

1

.344

.764

.202

.653

1.410

45*

1

.023

.707

.001

.974

1.023

60*

1

.856

.613

1.950

.163

2.354

Mancozeb-Lambda cyhalothrin

15*

1

 − .449

.913

.242

.623

.638

30*

1

.027

.707

.001

.970

1.027

45*

1

.546

.646

.714

.398

1.726

60*

1

1.188

.505

5.547

.019

3.282

Chlorpyrifos-Lambda cyhalothrin

15*

1

 − .948

.837

1.283

.257

.388

30*

1

.348

.558

.390

.532

1.417

45*

1

.994

.454

4.800

.028

2.703

60*

1

.340

.410

.686

.408

1.405

Quaternary

15*

1

 − .920

.837

1.207

.272

.399

30*

1

 − .661

.708

.872

.350

.516

45*

1

 − .108

.606

.032

.858

.897

60*

1

 − .543

.510

1.134

.287

.581

  1. *Hazard ratio constant with time; Pr > ChiSq indicates statistical significance if < 0.05
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