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Table 3 Final hierarchical multivariable linear-regression analysis of variables significantly ( P <0.05) associated with somatic cell count (SCC; transformed using the BoxCox power transformation) at monthly milk recordings during a follow-up period of 120 days after a veterinary treated clinical mastitis

From: Prevalence of bacterial genotypes and outcome of bovine clinical mastitis due to Streptococcus dysgalactiae and Streptococcus uberis

Variable1

β

S.E. (β)

P-value

LSM2

95% CI (LSM)

Intercept

3.996

0.17

-

-

-

Bacterial finding

     

S. dysgalactiae

Ref.3

-

-

86.6

70.1, 107.5

S. uberis

0.260

0.093

0.005

138.6

106.3, 182.6

Other factors

     

Parity

     

 First

Ref.

-

-

75.9

59.8, 97.1

 Second

0.219

0.113

0.051

112.0

82.8, 153.4

 Third

0.169

0.137

0.218

102.3

68.7, 155.6

 Fourth or higher

0.433

0.136

0.001

260.5

109.1, 260.5

Milk yield

−0.002

0.0005

0.000

-

-

 At Q1: 23.8 kg

-

-

-

132.8

108.1,164.2

 At Q2: 28.7 kg

-

-

-

109.8

92.0, 131.4

 At Q3: 33.4 kg

-

-

-

91.8

76.3, 111.0

Days in milk

−0.001

0.0004

0.001

-

-

 At Q1: 67 days

-

-

-

129.4

105.0, 160.5

 At Q2: 115 days

-

-

-

115.6

96.4, 139.3

 At Q3: 188 days

-

-

-

97.8

81.5, 117.7

  1. 1Q1, Q2, and Q3 = first quartile, second quartile/median, and third quartile, respectively.
  2. 2Least square means (LSM) of Box-Cox transformed SCC back-transformed to original scale (×1 000/ml) presented by variable.
  3. 3Ref. = Reference category.