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Table 4 Estimates from a linear regression model of the associations between risk factors and antimicrobial (AM) use (expressed as log-transformed (natural base) treatment incidence (TI) per 1000 pig-days at risk) in different age groups of pigs on 60 Swedish farrow-to-finish herds

From: Antimicrobial use in Swedish farrow-to-finish pig herds is related to farmer characteristics

 

Suckling piglets

Weaners

Fatteners

Adults

Risk factor

Estimate

Error

p

Estimate

Error

p

Estimate

Error

P

Estimate

Error

p

Intercept

-2.385

3.695

 

-4.561

4.980

 

0.569

2.205

 

3.338

2.138

 

Number of sows

0.000

0.001

0.975

0.000

0.001

0.881

0.005

0.003

0.060

0.001

0.001

0.319

Number of sows2*

      

0.000

0.000

0.042

   

Gender - male (n = 41)

-0.877

0.370

0.018

-0.447

0.370

0.226

-0.178

0.370

0.631

-0.003

0.370

0.995

- female (n = 18)

0.000

0.000

 

0.000

0.000

 

0.000

0.000

 

0.000

0.000

 

Education - non-unia (n = 39)

-0.725

0.323

0.025

-0.464

0.324

0.152

-0.112

0.331

0.736

-0.159

0.322

0.622

- uni (n = 20)

0.000

0.000

 

0.000

0.000

 

0.000

0.000

 

0.000

0.000

 

Age

0.392

0.131

0.003

0.351

0.146

0.016

0.021

0.027

0.439

-0.040

0.026

0.122

Age2*

-0.004

0.001

<0.001

-0.004

0.002

0.013

      

Years at work

0.027

0.027

0.310

-0.005

0.028

0.867

-0.016

0.027

0.562

0.014

0.027

0.600

Age at weaning

bna

  

0.032

0.043

0.466

      

Need for AMc

0.092

0.126

0.4682

-0.047

0.126

0.712

0.044

0.126

0.726

0.028

0.126

0.823

Risks of AMc

-0.196

0.143

0.1695

-0.210

0.145

0.148

0.052

0.143

0.719

-0.001

0.143

0.994

Benefits of AMc

-0.119

0.155

0.442

0.233

0.155

0.132

0.286

0.156

0.068

0.233

0.154

0.130

Vet’s contributionc

0.121

0.135

0.372

-0.003

0.135

0.984

-0.134

0.152

0.378

0.141

0.135

0.297

Internal biosecurityd

-0.022

0.019

0.237

0.004

0.019

0.823

-0.031

0.019

0.095

-0.024

0.018

0.192

External biosecurityd

-0.002

0.021

0.913

-0.033

0.021

0.115

0.011

0.020

0.578

0.001

0.020

0.957

  1. * The quadratic term auni university, vet veterinarian, b na not applicable; cStatements were assessed on a 6-point Likert scale, where higher scores indicated higher agreement, combined into four constructs and expressed as the mean score per construct; dScores for internal and external biosecurity range between 0 and 100, where 100 is “perfect biosecurity”