Table 1 Association between several independent variables (calendar month, year and milk purchaser) and SCC exceedance (> 400,000 cells/mL) using logistic regression, among supplying herds during 2019 and 2020

Month

 January

7.58

6.87—8.36

 February

4.42

4.02—4.85

 March

2.18

1.97—2.41

 May

0.75

0.66—0.85

 June

0.94

0.83—1.06

 July

1.10

0.98—1.24

 August

1.25

1.11—1.39

 September

1.06

0.94—1.19

 October

2.11

1.91—2.34

 November

7.02

6.41—7.68

 December

10.72

9.80—11.74

Year (2020)

0.87

0.84—0.90

Milk purchaser

 A

4.02

3.27—4.94

 C

1.03

0.71—1.49

 D

3.49

2.52—4.83

 E

4.65

3.75—5.77

 F

3.51

2.87—4.30

 G

1.92

1.54—2.39

 H

2.13

1.74—2.61

 I

5.09

4.16—6.22

 J

2.30

1.82—2.91

 K

4.21

3.40—5.22