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Table 2 Results of the multivariable regression for the probability of a French traditional free-range broiler flock to receive an antimicrobial treatment (cases, n = 52) compared to no antimicrobial treatment (controls, n = 208) up to 42 days of age, as adjusted by the farmer organizations, in 2016

From: Epidemiological assessment of the factors associated with antimicrobial use in French free-range broilers

Variable No. flocks Odds
Ratio
95% CI p-value
Use of chicken paper topped with starter feed
 Yes 213 0.29 0.09–0.87 0.027
 No 47 Reference   
Use of herbal drugs as a preventive measure
 Yes 37 0.09 0.01–0.49 < 0.01
 No 223 Reference   
Thickness of the litter
 10 cm or less 62 0.22 0.06–0.80 0.021
 11–15 cm 81 1.19 0.43–3.28 0.730
 15 cm or greater 117 Reference   
Cleaning and disinfection of the concrete perimeter of the poultry house at the previous downtime
 Yes 154 3.43 1.28–9.22 0.014
 No 106 Reference   
Perception of the mortality rate at 10 days
 High 83 58.71 9.56–372.26 < 0.01
 Normal 103 10.15 1.75–58.97 0.010
 Low 74 Reference   
Farmer reported a health problem between 11 and 42 days
 Yes 49 12.47 4.21–36.91 < 0.01
 No 211 Reference   
Phone call between the farmer and production technician between 11 and 42 days
 Yes 109 5.87 2.32–14.85 < 0.01
 No 151 Reference