Table 1.

Parameter estimates from three mixed-effects logistic regression models, assessing the association between being recorded as vaccinated and age for dogs, cats and rabbits attending a network of veterinary practices across Great Britain

Species	Random effects		Fixed effects
	Parameter	Variance	Parameter	Beta	s.e.	OR (95% CI)	P value
Dog	Practice	0.272	Intercept	1.587	0.058	4.887 (4.358–5.481)	<0.001
	Premise	0.040	Age centreda	0.021	0.004	1.022 (1.013–1.030)	<0.001
Cat	Practice	0.154	Intercept	0.979	0.052	2.662 (2.406–2.946)	<0.001
	Premise	0.088	Age centreda	0.036	0.005	1.037 (1.027–1.047)	<0.001
Rabbit	Practice	1.045	Intercept	−0.129	0.133	0.879 (0.677–1.142)	0.334
	Premise	0.140	Age centreda	0.125	0.021	1.133 (1.088–1.179)	<0.001

SE, standard error; OR, odds ratio; CI, confidence interval.

^aAge centred: mean age was 2.8 years in dogs, 3.0 years in cats and 2.3 years in rabbits.