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Table 2 Linear mixed regression models for IL-6, IFN-γ and IL-10 in dry period and early lactation.

From: Colonization and local host response following intramammary Staphylococcus chromogenes challenge in dry cows

Outcome variable

Predictor variable

Dry period

Early lactation

βa

SEb

LSMc

P

β

SE

LSM

P

IL-6 (pg/mL)

Quarter inoculation status

   

0.04d

   

NSd,e

 

 Non-inoculated

Ref.f

–

133.46

–

Ref.

–

34.37

–

 

 Inoculated and non-colonized

−58.50

17.98

74.96

0.05

−10.90

10.39

23.47

NS

 

 Inoculated and colonized

−75.44

17.49

58.02

0.03

−8.82

10.40

25.55

NS

 

Time of samplingh

   

 <0.01d

   

–

 

 D-1

Ref.

–

0.00

–

–

–

–

–

 

 D14

109.38

7.37

102.49

 <0.01

–

–

–

–

 

 D27

140.00

7.52

133.11

 <0.01

–

–

–

–

 

 D41

133.42

7.97

126.54

 <0.01

–

–

–

–

 

Time of sampling

   

–

   

 <0.01d

 

 C

–

–

–

–

Ref.

–

110.30

–

 

 L1

–

–

–

–

−32.89

6.45

77.41

 <0.01

 

 L2

–

–

–

–

−83.81

7.67

26.49

 <0.01

 

 L3

–

–

–

–

−108.58

8.09

1.72

 <0.01

 

 L4

–

–

–

–

−117.24

8.22

−6.94

 <0.01

 

 L5

–

–

–

–

−117.35

8.18

−7.05

 <0.01

 

 L6

–

–

–

–

−117.64

7.80

−7.34

 <0.01

 

Inoculation status × Time of samplingg

–

–

–

 <0.01d

–

–

–

 <0.01d

IFN-γ (pg/mL)

Quarter inoculation status

   

NSd

   

NSd

 

 Non-inoculated

Ref.

–

0.00

–

Ref.

–

0.32

–

 

 Inoculated and non-colonized

0.64

0.24

0.64

0.09

0.41

0.21

0.73

0.06

 

 Inoculated and colonized

0.83

0.22

0.83

0.06

0.19

0.21

0.52

NS

 

Time of sampling

   

 <0.01d

   

–

 

 D-1

Ref.

–

0.00

–

–

–

–

–

 

 D14

0.21

0.14

0.21

NS

–

–

–

–

 

 D27

0.46

0.15

0.46

 <0.01

–

–

–

–

 

 D41

1.28

0.16

1.28

 <0.01

–

–

–

–

 

Time of sampling

   

–

   

 <0.01d

 

 C

–

–

–

–

Ref.

–

1.43

–

 

 L1

–

–

–

–

−0.27

0.20

1.15

NS

 

 L2

–

–

–

–

−0.91

0.23

0.52

 <0.01

 

 L3

–

–

–

–

−1.25

0.23

0.18

 <0.01

 

 L4

–

–

–

–

−1.36

0.23

0.06

 <0.01

 

 L5

–

–

–

–

−1.31

0.23

0.11

 <0.01

 

 L6

–

–

–

–

−1.21

0.22

0.21

 <0.01

 

Inoculation status × Time of samplingg

–

–

–

 <0.01d

–

–

–

 <0.01d

IL-10 (pg/mL)

Quarter inoculation status

   

 <0.01d

   

NSd

 

 Non-inoculated

Ref.

–

4559.23

–

Ref.

–

1361.63

–

 

 Inoculated and non-colonized

−2618.91

336.24

1940.32

 <0.01

−874.42

572.75

487.21

NS

 

 Inoculated and colonized

−1965.67

303.55

2593.56

 <0.01

−761.25

573.07

600.38

NS

 

Time of sampling

   

 <0.01d

   

–

 

 D-1

Ref.

–

0.00

–

–

–

–

–

 

 D14

3832.82

264.36

3740.15

 <0.01

–

–

–

–

 

 D27

4228.92

285.91

4136.26

 <0.01

–

–

–

–

 

 D41

4433.06

287.82

4340.40

 <0.01

–

–

–

–

 

Time of sampling

   

–

   

 <0.01d

 

 C

–

–

–

–

Ref.

–

2499.53

–

 

 L1

–

–

–

–

103.34

218.62

2602.87

NS

 

 L2

–

–

–

–

−1019.34

262.75

1480.19

 <0.01

 

 L3

–

–

–

–

−2060.8

278.83

438.73

 <0.01

 

 L4

–

–

–

–

−3116.52

284.48

−616.99

 <0.01

 

 L5

–

–

–

–

−2971.28

283.08

−471.75

 <0.01

 

 L6

–

–

–

–

−2717.27

269.54

−217.74

 <0.01

 

Inoculation status × Time of samplingg

–

–

–

 <0.01d

–

–

–

 <0.01d

  1. Linear mixed regression models for the log10 transformed IFN-γ concentration (Log pg/mL) and 2-step approach transformed [45] IL-6 and IL-10 concentrations (pg/mL) in both the dry period and in early lactation
  2. aRegression coefficient of difference of LSM
  3. bStandard error
  4. cLeast square means
  5. dP value for overall effect
  6. fReference
  7. eNot significant
  8. gInteraction term visualized in Figure 4 based on the least square means
  9. hOverview of the experimental set-up and days of sampling is visualized in Figure 1