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Table 4 Distribution of estimated independent variables predicting antibiotic misuse patterns (Multinomial regression with appropriate use of antibiotics as reference category)

From: Antibiotic use in chicken farms in northwestern China

Variable

Misuse

Pattern I

Pattern II

Pattern III

RRR (95% CI)

RRR (95% CI)

RRR (95% CI)

Education level

 Primary

ref.

ref.

ref.

 Secondary

0.06 (0, 0.88) *

0.37 (0.02, 6.25)

0.18 (0.01, 4.31)

 ≥ High school

0.01 (0,0.3) **

0.07 (0, 1.56)

0.40 (0.02, 9.64)

Gender

 Male

ref.

ref.

ref.

 Female

0.83 (0.15, 4.54)

0.52 (0.09, 2.99)

0.72 (0.1, 5.39)

Family income /month (yuan)

 < 5000

ref.

ref.

ref.

 ≥ 5000

0.08 (0.01, 0.68) *

0.16 (0.02, 1.10)

0.39 (0.04, 3.56)

Formal farming training

 No

ref.

ref.

ref.

 Yes

1.14 (0.24, 8.27)

0.91 (0.18, 4.70)

0.08 (0.01, 0.79) *

Knowledge of risks

 Median (IQR)

2.81 (0.98, 8.04)

2.63 (0.96, 7.22)

2.34 (0.73, 7.55)

Farm size

 Small

ref.

ref.

ref.

 Medium

8.2 (1.31, 51.19) *

1.92 (0.37, 10.07)

1.77 (0.24, 13.11)

 Large

0 (0)

0 (0)

0.08 (0,2.03)

  1. * P < 0.05; **P < 0.01; CI Confidence interval, RRR Relative risk ratio. IQR Interquartile range, Ref Reference group. Pattern I: Excessive use of prohibited antibiotics; Pattern II: Moderate use of prohibited antibiotics; Pattern III: Use of many kinds of prohibited antibiotics