Table 5 Odds ratios and p-values for the mixed logistic regression model describing the effect of body system treated, number of antimicrobials used and the use of neomycin upon treatment failure in 676 OSVS records, when antimicrobials were used in treatment (July 1, 2007 – July 30, 2009)

System

0.01

GI

Referent

-

-

Multisystemic

3.14

0.99

<0.01

Musculoskeletal

2.39

1.00

0.04

Other

1.96

0.76

0.08

Respiratory

2.40

0.75

<0.01

Not recorded

1.47

0.78

0.46

Number of antimicrobials used

0.01^a

1

Referent

-

-

2

2.29

0.72

<0.01

3 or more

7.56

6.10

0.01

Neomycin

0.34

0.15

0.02

Intercept

1.02

0.41

0.97

Random intercepts

Variance

Standard error

P-value

Practitioner

0.81

0.62

<0.01^b

Farm

0.60

0.39