Table 3. Multivariate model of the relationship between respiratory score (RS) and skull conformation, health and lifestyle variables.

Variable	Sub-category	Coefficient	SE	t	P
Muzzle ratio (M%)	Continuous	-0.04	0.017	-2.25	0.026
Nose position ratio (NP%)	Continuous	-0.07	0.012	-6.21	<0.001
Tear staining	No	-0.91	0.191	-4.77	<0.001
	Yes	Reference
Activity level	Sedentary	0.75	0.28	2.61	0.010
	Adequate	0.26	0.26	0.97	0.332
	Active	0.17	0.28	0.60	0.547
	Very active	Reference