DXA, bioelectrical impedance, ultrasonography and biometry for the estimation of fat and lean mass in cats during weight loss

Table 2 Equations to predict cat fat mass and stepwise multiple regression (adjusted coefficient of determination ( r ² ), Mallows’Cp statistic (Cp), statistical significance (p) and root mean square error (RMSE))

	Equations for fat mass estimation (kg)	Equation number	r ²	Cp	p	RMSE (kg)
M (n = 24)	0.7BW + 3.22PC/TC–0.005BW/RTL-4	1	0.94	1.23	=0.04	0.19
F (n = 24)	−0.07BL + 0.9BW + 0.008R - 0.60	2	0.93	1.97	=0.01	0.17
	0.4BW + 11.50 SFLT-0.69	3	0.94	3.46	=0.01	0.16
M and F (n = 48)	0.4BW + 0.006R + 9.67 SFLT-1.84	4	0.90	1.25	=0.009	0.21
	−0.05BL + 0.7BW + 0.007R - 0.60	5	0.88	1.95	=0.009	0.24
	0.3BW + 9.97 SFLT-0.57	6	0.88	2.90	=0.009	0.23
T0 (n = 16)	0.5BW + 0.007R - 1.88	7	0.86	6.50	=0.05	0.25
T1 (n = 16)	0.4BW + 0.01R + 16.13 SFLT-2.71	8	0.93	1.20	=0.009	0.17
	0.6BW + 0.01R-2.84	9	0.86	1.01	=0.04	0.24
	0.3BW + 15.49 SFLT-0.69	10	0.86	0.75	=0.04	0.24
T2 (n = 16)	0.5BW + 3.55PC/TC–0.005BW/RTL + 8.48 SFLT-3.74	11	0.94	5.00	=0.02	0.12
	−0.022BL + 0.7BW + 4.24PC/TC–0.006BW/RTL-3.65	12	0.94	4.50	=0.02	0.13

M, males; F, females; BW, body weight; T0, (time zero – obese animals); T1, (time one −10% reduction in BW); T2 (time two – 20% reduction in BW); BL, body length; PC, pelvic circumference; TC, thoracic circumference; RTL, right thoracic limb length; R, resistance; SFLT, subcutaneous fat layer thickness.

ISSN: 1746-6148