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Table 5 Logistic regression model for clinical variables related to killing or spontaneously death of newborn piglets dying until day 5 of age

From: Killing underweighted low viable newborn piglets: Which health parameters are appropriate to make a decision?

Risk categories

Alive

Dead

Univariable model

Multivariable model

n

%

n

%

OR

95%-CI

p

OR

95%-CI

pb

Low

Up

  

Low

Up

 

Total

372

71.68

147

28.32

x

x

x

x

x

x

x

x

Herd/group (p = 0.0033) a

 11(ref)

26

56.52

20

43.48

1

x

x

x

1

x

x

x

 12

27

65.85

14

34.15

0.674

0.282

1.609

0.3741

0.229

0.053

0.984

0.4722

 13

19

51.35

18

48.65

1.232

0.516

2.937

0.6386

0.618

0.145

2.636

0.2897

 21

33

73.33

12

26.67

0.473

0.196

1.141

0.0956

0.281

0.074

1.071

0.7145

 22

25

60.98

16

39.02

0.832

0.353

1.959

0.6738

0.845

0.239

2.989

0.0373

 23

38

74.51

13

25.49

0.445

0.189

1.049

0.0643

0.326

0.086

1.232

0.9287

 31

26

83.87

5

16.13

0.250

0.082

0.767

0.0153

0.083

0.014

0.479

0.0451

 32

35

87.50

5

12.50

0.186

0.062

0.560

0.0028

0.212

0.048

0.933

0.4034

 33

38

95.00

2

5.00

0.068

0.015

0.318

0.0006

0.102

0.017

0.627

0.1074

 41

43

82.69

9

17.31

0.272

0.108

0.686

0.0058

0.195

0.055

0.687

0.2282

 42

28

66.67

14

33.33

0.650

0.273

1.547

0.3301

1.523

0.430

5.394

0.0005

 43

34

64.15

19

35.85

0.726

0.323

1.632

0.4390

0.401

0.117

1.369

0.6833

Body weight (p = 0.0418) a

  ≤ 0.86 kg

69

41.07

99

58.93

23.475

11.870

46.424

 < .0001

3.715

1.103

12.507

0.1221

 0.86–1 kg

123

76.88

37

23.13

4.922

2.417

10.023

 < .0001

2.973

1.238

7.140

0.1885

  > 1 kg (ref)

180

94.24

11

5.76

1

x

x

x

1

x

x

x

Vitality score (p ≤ .0001) a

 0 (ref)

296

90.80

30

9.20

1

x

x

x

1

x

x

x

 1

74

54.41

62

45.59

8.265

4.989

13.694

 < .0001

3.325

1.589

6.958

0.0710

 2

2

3.51

55

96.49

271.333

63.013

1168.351

 < .0001

61.358

10.609

354.867

 < .0001

Intrauterine growth retardation score (p = 0.1765) a

 0 (ref)

274

88.10

37

11.90

1

x

x

x

1

x

x

x

 1

86

63.24

50

36.76

4.305

2.640

7.022

 < .0001

1.582

0.656

3.814

0.6534

 2

12

16.67

60

83.33

37.027

18.231

75.201

 < .0001

3.412

0.929

12.538

0.0678

Rectal temperature (p = 0.0003) a

  ≤ 37.5 °C

48

32.21

101

67.79

14.818

9.336

23.519

 < .0001

3.372

1.745

6.517

0.0003

  > 37.5 °C (ref)

324

87.57

46

12.43

1

x

x

x

1

x

x

x

Sex (p = 0.0680)a

 Female (ref)

187

73.91

66

26.09

1

x

x

x

1

x

x

 

 Male

185

69.55

81

30.45

1.241

0.846

1.820

0.2704

1.712

0.961

3.049

0.0680

  1. Due to missing values vitality scores 2 and 3 were aggregated to one category for modelling purposes
  2. ref, reference category; OR, odds ratio estimate; CI, confidence limits; p, level attained for the statistical test associated
  3. aGeneral p value Wald’s Chi2-test (p < 0.05 are marked in bold)
  4. bp value Wald’s Chi2-test (p < 0.05 are marked in bold) to the reference category
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Porcine Health Management

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