Table 3 Clinical mastitis - characteristics of the study population ( n =  409) and univariable analyses

FMD

Yes

323

79.0

-

-

18.0 (13.7, 23.7)

1.3 (0.68, 2.5)

0.43

No

86

21.0

-

13.8 (7.6, 24.9)

Age (quintiles)

1.5- < 2.0y

81

19.8

54 (66.7)

0.0073^a

3.4 (1.1, 10.6)

1.8^b (1.5, 2.2)

<0.0001

2.0- < 2.8y

82

20.1

61 (74.4)

7.5 (3.3, 16.6)

2.8- < 3.5y

82

20.1

71 (86.6)

17.8 (10.3, 30.7)

3.5- < 4.3y

83

20.3

73 (88.0)

18.1 (10.5, 31.2)

4.3-9.7y

81

19.8

64 (79.0)

50.8 (35.1, 73.6)

Parity

0

146

35.7

107 (73.3)

0.042^a

1.9 (0.6, 6.0)

1.7 ^b (1.4, 2.1)

<0.0001

1

138

33.7

110 (79.7)

22.4 (15.3, 32.9)

2

77

18.8

67 (87.0)

33.2 (21.6, 50.9)

3

29

7.1

22 (75.9)

29.1 (13.1, 64.9)

≥4

19

4.7

17 (89.5)

55.6 (26.5, 126.0)

Days in milk ^c

Pre-lactating

138

33.7

102 (73.9)

0.027

1.4 (0.34, 5.4)

1.7 ^b (1.4, 2.0)

<0.0001

Early-lactation (<0-100d)

107

26.2

88 (82.2)

18.5 (11.5, 29.7)

Mid-lactation (101-250d)

85

20.8

75 (88.2)

27.7 (17.7, 43.5)

Late-lactation (>250d)

44

10.8

35 (79.6)

45.2 (26.8, 76.3)

Dry

35

8.6

23 (65.7)

37.8 (20.9, 68.2)

Breed

100% Exotic breed

351

85.8

285 (81.2)

0.0046^a

15.7 (11.9, 20.7)

1.3 ^b (1.0, 1.8)

0.053

<25% Indigenous

27

6.6

20 (74.1)

23.5 (10.6, 52.3)

25% Indigenous

19

4.7

10 (52.6)

12.8 (3.2, 51.1)

50% indigenous

12

2.9

8 (66.7)

54.8 (22.8, 131.6)