Table 3 Prevalence of subclinical mastitis in relation to different variables

Species

cattle

200

81

40.5

33.94–47.42

χ2 = 0.166 d = 1 P = 0.684

buffalo

150

64

42.6

35.04–50.67

Age (years)

2–4

80

28

35

25.45–45.92

χ2 = 11.643 d = 2 P = 0.003*

 > 4–8

158

81

51.3

43.54–58.94

 > 8

112

36

32.1

24.21–41.26

hand washing between milkings

Yes

140

28

20.00

14.22–27.39

χ2 = 44.155 d = 1 P < 0.0001*

No

210

117

55.7

48.95–62.27

parity

1–2

70

22

31.4

21.76–43.03

χ2 = 8.881 d = 2 P = 0.012

3–4

180

70

38.9

32.07–46.17

 > 4

100

53

53.00

43.29–62.49

lactation stage

15–60

65

19

29.2

19.58–41.2

χ2 = 6.993 d = 2 P = 0.030*

 > 60–120

165

67

40.6

33.41–48.23

 > 120

120

59

49.2

40.39–58

Teat dipping

Yes

20

3

15.00

5.24–36.04

χ2 = 6.106 d = 1 P = 0.013*

No

330

142

43.0

37.8–48.42

history of previous mastitis

Yes

72

40

55.6

44.09–66.47

χ2 = 7.455 d = 1 P = 0.006*

No

278

105

37.8

32.27–43.6

Total

350

145

41.4

36.39–46.66