Table 6.
Final multivariable mixed-effects logistic regression model, with cow nested in herd being random factors, of risk factors significantly associated with SCM in the Savannah region of Nigeria
| Variable | Level | OR (adjusted) | SE | z | Pvalue | 95%CI | *Chi square | *DF | *Pvalue |
|---|---|---|---|---|---|---|---|---|---|
| Age (years) |
Old |
1.00 |
Ref |
Ref |
Ref |
Ref |
17.40 |
1 |
< 0.001 |
| |
Young |
0.283 |
0.087 |
−4.11 |
< 0.001 |
0.155; 0.516 |
|
|
|
| Washing hands before milking |
No |
1.00 |
Ref |
Ref |
Ref |
Ref |
9.05 |
1 |
0.003 |
| |
Yes |
0.173 |
0.103 |
−2.95 |
0.003 |
0.054; 0.554 |
|
|
|
| Breed |
White Fulani |
1.00 |
Ref |
Ref |
Ref |
Ref |
7.83 |
3 |
0.050 |
| |
Sokoto Gudali |
2.601 |
1.222 |
2.03 |
0.042 |
1.036; 6.533 |
|
|
|
| |
Holstein-Friesian |
1.914 |
0.875 |
1.42 |
0.156 |
0.781; 4.688 |
|
|
|
| |
Rahaji |
8.205 |
6.956 |
2.48 |
0.013 |
1.557; 43.226 |
|
|
|
| Quarter |
LFQ |
1.00 |
Ref |
Ref |
Ref |
Ref |
17.13 |
3 |
0.001 |
| |
LHQ |
0.462 |
0.103 |
−3.46 |
0.001 |
0.298; 0.715 |
|
|
|
| |
RFQ |
0.446 |
0.010 |
−3.61 |
< 0.001 |
0.287; 0.691 |
|
|
|
| RHQ | 0.614 | 0.135 | −2.22 | 0.027 | 0.399; 0.945 |
* The effect of potential risk factors in the multivariable mixed-effects logistic regression model; SCM = subclinical mastitis.