Table 6.

Estimation of body fat (%) using the multivariable regression analysis.

Variable	Female				Variable	Male
	Intacta		Spayedb			Intacta		Neuteredc
	B (SE)	p-value	B (SE)	p-value		B (SE)	p-value	B (SE)	p-value
Constant	21.667 (1.778)	<0.001	26.238 (1.894)	<0.001	Constant	24.000 (1.053)	<0.001	31.421 (3.005)	<0.001
Age range					Age range
1-2 years	Reference		Reference		1-2 years	Reference		Reference
3-4 years	0 (N/A)	1.000	0.451 (2.083)	0.829	3-4 years	1.333 (1.852)	0.472	0.839 (5.805)	0.886
5-6 years	6.667 (2.061)	0.001	7.102 (2.447)	0.005	5-6 years	7.000 (2.272)	0.002	5.130 (3.607)	0.166
7-8 years	10.333 (2.326)	<0.001	7.887 (2.180)	<0.001	7-8 years	9.333 (2.197)	<0.001	8.485 (2.487)	0.002
9-10 years	9.000 (2.899)	0.002	8.494 (2.822)	0.003	9-10 years	6.000 (2.959)	0.044	1.995 (4.198)	0.638
≥11 years	7.667 (2.481)	0.002	9.257 (2.813)	0.001	≥11 years	5.000 (2.445)	0.042	10.985 (2.950)	0.001
Food type					Letting activity outside house
Dry diet	Reference		Reference		Never	Reference		Reference
Owner cook	-0.667 (2.019)	0.742	1.536 (2.280)	0.502	1 time/day	4.333 (2.655)	0.104	2.476 (2.531)	0.336
Dry diet with food dog	-1.333 (3.499)	0.704	1.929 (3.785)	0.612	>1 time/day	2.333 (2.357)	0.323	6.423 (1.763)	0.001
Dry diet with owner cook	3.667 (1.895)	0.054	-1.781 (2.116)	0.402	Meal/day
Canned dog food	-1.000 (10.148)	0.922	N/A	N/A	1 time/day			Reference
Owner cook and canned food	-7.667 (10.232)	0.455	7.172 (7.871)	0.365	2 times/day			-5.479 (2.299)	0.024
Letting activity outside house					3 times/day			-11.164 (1.944)	<0.001
Never			Reference		>3 times/day			-11.780 (3.381)	0.002
1 time/day			5.334 (3.277)	0.107	Snacks
>1 time/day			0.005 (2.795)	0.999	No			Reference
					Yes			5.970 (2.674)	0.033

Statistical analysis by quantile regression (a), multiple linear regression (b) and multiple linear regression with robust variance estimates (c). Comparison of mean or median of body fat between variable and reference. p ≤ 0.05 were considered significant and N/A is not applicable.