Table 1.

Choice of generalised linear models used to investigate associations between serovar-specific SNP threshold cluster outcomes and population and month of cluster identifications

Geographical level	Outcome	Model type
Local	S. Enteritidis 0 SNP 0 clusters	Logistic
	S. Typhimurium 0 SNP 0 clusters	Logistic
Regional	S. Enteritidis SNP 0 clusters	Logistic
National	S. Enteritidis SNP 0 clusters	Poisson
	S. Enteritidis SNP 5 clusters	Poisson
	S. Enteritidis SNP 10 clusters	Logistic
	S. Typhimurium SNP 0 clusters	Poisson
	S. Typhimurium SNP 5 clusters	Logistic
	S. Typhimurium SNP 10 clusters	Logistic