Estimating canine cancer incidence: findings from a population-based tumour registry in northwestern Italy.

As there was a decreasing trend for cancer cases at the end of 2002, we also calculated the incidence rates after splitting the registration period into two parts, before and after 01 June 2003 (period 1 vs. period 2); no statistically significant difference in the rates of malignant tumours was found (rate ratio [RR] 1.09, 95% CI 0.89–1.31) (Table 1 ).

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