Table 1.

Crude incidence rates

	Number of cases	Dog-years	IR	95% CI
Crude	554	68,865	804	739–874
Female	344	31,113	1106	992–1229
Male	209	37,748	554	481–634
Purebred	311	32,820	948	845–1059
Crossbreed	233	36,045	646	566–735
Period 1	151	17,599	858	727–1006
Period 2	403	51,266	786	711–867

Malignant tumour incidence rates by sex, breed, and calendar period (cases per 100,000 dog-years at risk). CI denotes confidence interval, IR incidence rate