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Table 4 Estimated odds ratios (OR) and their 95% confidence intervals (CI) for the effect of pre-milking teat preparation and management period on Staphylococcus spp. (STA), Streptococcus spp. (STR) and coliform (COL) counts

From: Effect of pre-milking teat preparation procedures on the microbial count on teats prior to cluster application

Variable

OR

95% CI

P-value

Probability of STA

   

Wash and dry

1

  

Iodine

2.30

0.91 - 6.09

 

Chlorhexidine

4.46

1.63 - 13.55

0.01

Chorine

1.90

0.77 - 4.81

 

Wipes

4.46

1.63 - 13.55

0.01

No prep

0.01

0.00 - 0.08

0.001

Management period

   

Outdoor

1

  

Indoor

0.54

0.27-1.02

0.06

Probability of STR

   

Wash and dry

1

  

Iodine

1.24

0.51 - 3.00

 

Chlorhexidine

1.65

0.68 - 4.05

 

Chorine

3.45

1.34 - 9.47

0.01

Wipes

3.45

1.34 - 9.4

0.01

No prep

0.01

0.00 - 0.09

0.001

Management period

   

Outdoor

1

  

Indoor

0.99

0.99-0.54

 

Probability of COL

   

Wash and dry

1

  

Iodine

0.65

0.138 - 2.69

 

Chlorhexidine

0.79

0.19 - 3.08

 

Chorine

1.23

0.35 - 4.48

 

Wipes

0.79

0.19 - 3.08

 

No prep

0.08

0.00 - 0.73

0.05

Management period

   

Outdoor

1

  

Indoor

0.28

0.09 - 0.70

0.01