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Table 5 Cox PH model summary of all predictors on survival of fingerlings

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

Pesticide

Parameter estimate

SE

Chi-square

df

Pr > ChiSq

Hazard ratio

95.0% CI for the hazard ratio

Lower

Upper

Atrazine-Mancozeb

Species

.245

.978

.063

1

.802

1.278a*

.188

8.685

15 min

 − .483

.572

.713

1

.398

.617

.201

1.894

30 min

 − 1.102

.613

3.228

1

.072

.332

.100

1.105

45 min

.156

.522

.089

1

.766

1.168

.420

3.250

60 min

  

4.509

3

.212

   

Weight

 − 5.220

2.737

3.636

1

.057

.005

.000

1.157

Length

1.132

1.011

1.254

1

.263

3.103

.427

22.521

Condition factor

1.670

.708

5.560

1

.018

5.312

1.326

21.284

Atrazine-Chlorpyrifos

Species

.129

.574

.051

1

.822

1.138a+

.369

3.504

15 min

 − 1.165

.410

8.083

1

.004

.312

.140

.696

30 min

 − .696

.385

3.267

1

.071

.499

.234

1.061

45 min

 − .530

.365

2.101

1

.147

.589

.288

1.205

60 min

  

8.531

3

.036

   

Weight

 − 4.661

1.844

6.387

1

.011

.009

.000

.351

Length

1.063

.658

2.611

1

.106

2.895

.797

10.507

Condition factor

1.007

.329

9.375

1

.002

2.737

1.437

5.213

Atrazine-Lambda cyhalothrin

Species

.554

.610

.825

1

.364

1.740a+

.526

5.751

15 min

 − 2.117

.504

17.650

1

.000

.120

.045

.323

30 min

 − 1.290

.403

10.265

1

.001

.275

.125

.606

45 min

 − .967

.365

7.039

1

.008

.380

.186

.777

60 min

  

23.436

3

.000

   

Weight

 − 6.316

3.407

3.436

1

.064

.002

.000

1.436

Length

 − .210

.770

.074

1

.785

.811

.179

3.668

Condition factor

 − .021

.413

.003

1

.960

.979

.436

2.200

Mancozeb-Chlorpyrifos

Species

 − .566

.540

1.098

1

.295

.568b+

.197

1.637

15 min

 − 1.163

.552

4.430

1

.035

.313

.106

.923

30 min

 − .938

.493

3.625

1

.057

.391

.149

1.028

45 min

 − .099

.460

.047

1

.829

.906

.368

2.229

60 min

  

6.799

3

.079

   

Weight

 − 1.823

4.821

.143

1

.705

.162

.000

2050.017

Length

 − 1.790

1.242

2.079

1

.149

.167

.015

1.903

Condition factor

 − 1.165

.895

1.694

1

.193

.312

.054

1.802

Mancozeb-Lambda cyhalothrin

Species

.537

.701

.587

1

.444

1.711a+

.433

6.760

15 min

 − 2.674

.573

21.746

1

.000

.069

.022

.212

30 min

 − 1.342

.456

8.657

1

.003

.261

.107

.639

45 min

 − 1.167

.451

6.682

1

.010

.311

.129

.754

60 min

  

23.575

3

.000

   

Weight

 − 2.991

1.331

5.048

1

.025

.050

.004

.683

Length

.541

.651

.691

1

.406

1.718

.480

6.150

Condition factor

1.692

.649

6.785

1

.009

5.428

1.520

19.385

Chlorpyrifos-Lambda cyhalothrin

Species

1.716

.488

12.379

1

.000

5.563a#

2.139

14.472

15 min

 − 2.696

.475

32.190

1

.000

.067

.027

.171

30 min

 − 1.308

.364

12.924

1

.000

.270

.132

.552

45 min

 − .187

.337

.309

1

.579

.829

.428

1.606

60 min

  

38.745

3

.000

   

Weight

3.244

.779

17.326

1

.000

25.627

5.564

118.033

Length

 − 2.825

.591

22.856

1

.000

.059

.019

.189

Condition factor

.302

.483

.392

1

.531

1.353

.525

3.485

Quaternary

Species

2.779

.691

16.162

1

.000

16.099a#

4.154

62.396

15 min

 − .990

.478

4.284

1

.038

.371

.145

.949

30 min

 − 1.298

.462

7.884

1

.005

.273

.110

.676

45 min

 − .378

.394

.921

1

.337

.685

.316

1.483

60 min

  

10.245

3

.017

   

Weight

 − 1.280

.946

1.831

1

.176

.278

.044

1.775

Length

.719

.389

3.418

1

.064

2.053

.958

4.402

Condition factor

3.426

.619

30.678

1

.000

30.748

9.148

103.347

  1. aIndicates increase in hazard ratio, while bindicates a decrease in hazard ratio compared with when other predictors were held constant; *indicates significant when other predators were held constant but no longer significant; +indicates not significant when other predators were held constant and not significant now; #indicates not significant when other predators were held constant but now significant