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Table 4 Comparison of fat mass (FM) and lean mass (LM) determined by DXA and estimated by the equations 1 to 19 (means and SD) in cats

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

 

DXA (kg)

Estimated values (kg)

Equation number

p value (t-Test)

Linear regression

r 2

FM

M (n = 24)

1.49 (0.71)

2.88 (0.94)

1

<0.0001

y = 0.728x - 0.605

0.93

F (n = 24)

1.46 (0.60)

1.37 (0.57)

2

= 0.60

y = 1.014x + 0.069

0.92

  

1.53 (0.59)

3

= 0.67

y = 0.976x - 0.036

0.94

M and F (n = 48)

1.48 (0.65)

1.49 (0.62)

4

= 0.90

y = 1.002x - 0.019

0.91

  

1.40 (0.59)

5

= 0.55

y = 1.034x + 0.028

0.88

  

1.26 (0.56)

6

= 0.09

y = 1.086x + 0.105

0.88

T0 (n = 16)

1.95 (0.59)

1.89 (0.52)

7

= 0.78

y = 1.042x - 0.023

0.85

T1 (n = 16)

1.43 (0.45)

1.60 (0.61)

8

= 0.43

y = 0.932x - 0.058

0.93

  

1.61 (0.58)

9

= 0.38

y = 0.945x - 0.094

0.85

  

1.41 (0.54)

10

= 0.94

y = 1.004x + 0.010

0.86

T2 (n = 16)

1.05 (0.45)

2.21 (0.61)

11

<0.0001

y = 0.691x - 0.473

0.89

  

2.59 (0.68)

12

<0.0001

y = 0.612x - 0.535

0.87

LM

M (n = 24)

3.04 (0.52)

8.19 (0.48)

13

<0.0001

y = 0.882x - 4.179

0.67

F (n = 24)

2.49 (0.40)

1.79 (0.27)

14

<0.0001

y = 1.299x + 0.168

0.79

M and F (n = 48)

2.76 (0.53)

1.59 (0.25)

15

<0.0001

y = 1.868x - 0.202

0.75

  

1.15 (0.19

16

<0.0001

y = 2.047x + 0.402

0.52

T0 (n = 16)

2.85 (0.54)

3.13 (0.55)

17

= 0.15

y = 0.925x - 0.051

0.87

T1 (n = 16)

2.77 (0.54)

1.68 (0.36)

18

<0.0001

y = 2.008x - 0.210

0.78

T2 (n = 16)

2.68 (0.54)

0.44 (0.15)

19

<0.0001

y = 2.651x + 1.509

0.56

  1. M, males; F, females; T0 (before weight loss [WL]); T1 (after 10% of WL); T2 (after 20% of WL); y = estimated value; x = determined value.