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Table 3 Multiple linear regressions analyses by payment class based on milk quality according to bulk tank somatic cell count (BTSCC) means and standard deviations (in this analysis only class 1, 2, 3 and 4 were used)

From: Month-wise variation and prediction of bulk tank somatic cell count in Brazilian dairy herds and its impact on payment based on milk quality

Class

Variable

Estimated parameter

Std. Error3

p-value*

R2-Adjusted

Class 11

Intercept

11.87

2.98

0.001

0.88

BTSCC mean

1.83−4

2.17−5

<0.001

Standard deviation

8.39−5

1.00−5

<0.001

Class 21,2

Intercept

0.66

0.07

<0.001

0.88

BTSCC mean

2.27−6

2.33−7

<0.001

Standard deviation

9.69−7

1.32−7

<0.001

Class 31,2

Intercept

0.52

0.20

0.324

0.74

BTSCC mean

2.32−6

4.49−7

0.001

Standard deviation

−1.61−7

1.42−7

0.292

Class 41,2

Intercept

−0.05

0.07

0.456

0.93

BTSCC mean

2.07−6

1.04−7

<0.001

Standard deviation

7.37−8

9.03−8

0.421

  1. *Statistically significant difference considered p < 0.05; 1Class 1–1000 to 200,000 cells/mL, Class 2–201,000 to 400,000 cells/mL, Class 3–401,000 to 500,000 cells/mL, Class 4–501,000 to 800,000 cells/mL, Class 5 - > 800,000 cells/mL; 2dependent variable was transformed to log10; 3Standard error