Univariable analysis of the association between meteorological covariates (time-changing and time-lagged) and time to infection of premises in the largest cluster (n = 3153), northwest of Sydney, during the 2007 equine influenza outbreak in Australia.

aP-values derived from likelihood ratio tests (LRT) comparing univariable to null Cox regression models.
bMaximum daily wind speed based on wind from all directions (‘undirected’), making no assumption concerning nearest infected premises assumption.