Hormonal and Sex Impact on the Epidemiology of Canine Lymphoma

Table 3

Logistic regression model defining the risk of a diagnosis of lymphoma in dogs in the VMDB (1964–2002) as a function of age.

Age Group	Case (%)	Control (%)	Odds Ratio	95% C.I.	P-value
Less than 4 years	1,791 (12.3)	606,667 (52.4)	1	*	*
4–7 years	4,626 (31.7)	222,206 (19.2)	6.73	(6.36, 7.11)	<.0001
7–10 years	4,385 (30.1)	173,877 (15.0)	7.78	(7.35, 8.24)	<.0001
10–15 years	3,553 (24.4)	142,778 (12.4)	8.06	(7.60, 8.55)	<.0001
More than 15 years	218 (1.5)	11,814 (1.0)	6.96	(6.03, 8.03)	<.0001

*Baseline exposure; therefore coefficient and P values are not provided and OR is defined as 1.