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Table 4 Univariable analysis of risk factors associated with SCM in lactating cow on herds in the Savannah region of Nigeria

From: Sub-clinical mastitis and associated risk factors on lactating cows in the Savannah Region of Nigeria

Variable

OR (crude)

SE

z

P value

95 % CI

Quarter

0.918

0.048

−1.65

0.100

0.828; 1.016

Month

1.223

0.098

2.52

0.012

1.046; 1.430

Herd size

0.910

0.002

−0.31

0.758

0.996; 1.003

Management system

1.254

0.150

1.89

0.059

0.992; 1.585

Breed

1.241

0.094

2.85

0.004

1.069; 1.439

Cow type

1.333

0.159

2.40

0.016

1.054; 1.685

Cow origin

0.987

0.115

−0.11

0.914

0.785; 1.241

Age (years)

2.041

0.243

5.99

<0.001

1.616; 2.577

Parity

2.081

0.271

5.62

<0.001

1.611; 2.686

BCS

0.999

0.069

−0.01

0.991

0.873; 1.144

Washing of teat

0.755

0.100

−2.11

0.035

0.582; 0.980

Pre-striping before milking

0.359

0.155

−2.37

0.018

0.154; 0.836

Washing hands before milking

0.314

0.085

−4.28

<0.001

0.184; 0.533

Heifer and cow

0.245

0.121

−2.86

0.004

0.093; 0.643

Replacement heifers

0.926

0.130

−0.55

0.584

0.703; 1.219

Feeding after milking

2.787

1.203

2.37

0.018

1.196; 6.496

  1. *Associations were evaluated by obtaining a crude OR estimate; variables with values of P ≤ 0.20 were considered significant and included in subsequent multivariable analysis; SCM = sub-clinical mastitis.