Fig. 3

Comparison of farm characteristics between the three farm groups obtained by PCA. Brackets with an asterisk on top indicate a significant difference between two groups. If brackets are absent, the difference was non-significant. Bar plots with PRRS and ZnOAb indicate the number of farms positive and negative to PRRS, and using ZnOAb or not. AMR: antimicrobial resistance; mort.: mortality; N: no; Neg.: negative; Pos.: positive; prev.: prevalence; PRRS: porcine reproductive and respiratory syndrome status; W + F mort.: sum of the mortality in the weaner and finisher stages; Y: yes; ZnOAb: use of zinc oxide and medicated feed. Farm groups are 1: high-performing farms, 2: intermediate-performing farms and 3: low-performing farms