Distribution of between-farm association frequency and analysis scenarios. A comparison between large (1079-1623 associations, n = 147 farms) and small/medium (1-879 associations, n = 515 farms) between-farm association frequencies formed scenario 1 analyses, and a comparison between medium (301-897 associations, n = 141 farms) and small (1-299 associations, n = 374 farms) between-farm association frequencies formed scenario 2 analyses. Note: this figure refers to the analysis prior to the removal of records with missing data (i.e. n = 662 farms) and was not qualitatively different following this data reduction.
Nickbakhsh et al. BMC Veterinary Research 2011 7:66 doi:10.1186/1746-6148-7-66