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Table 2 Performance of the CASA (LBMPE1) and previously published FFM prediction equations in the NWAHS and FAMAS cohorts (age 50 years and over) in the combined cohort and by gender

From: Lean body mass: the development and validation of prediction equations in healthy adults

 

Mean (SD), kg

Mean error (95%CI), kg

P-value for mean error

R

ρ c(95% CI) [C b]

95% limits of agreement

RMSE (95% CI), kg

Total (n = 2287)

       

LBM DXA

50.62 (10.8)

      

Heitmann equation

54.30 (10.7)

3.68 (3.53, 3.83)

<0.001

0.940*

0.888 (0.880, 0.896) [0.945]

-3.77, 11.1

5.24 (4.97, 5.51)

Janmahasatian equation

54.23 (11.0)

3.61 (3.46, 3.76)

<0.001

0.943*

0.884 (0.884, 0.899) [0.946]

-3.78, 11.0

5.17 (4.90, 5.44)

Deurenberg equation

50.64 (10.1)

0.02 (-0.14, 0.19)

0.777

0.931*

0.928 (0.923, 0.934) [0.998]

-7.89, 7.93

3.95 (3.70, 4.20)

LBM PE1

51.36 (10.6)

0.74 (0.59, 0.89)

<0.001

0.942*

0.939 (0.934, 0.944) [0.998]

-6.58, 8.06

3.73 (2.48, 4.98)

Men (n = 1436)

       

LBM DXA

57.09 (7.50)

      

Heitmann equation

60.56 (7.80)

3.46 (3.25. 3.67)

<0.001

0.863*

0.782 (0.764, 0.800) [0.906]

-11.5, 4.57

5.30 (4.93, 5.67)

Janmahasatian equation

61.18 (6.80)

4.09 (3.89, 4.29)

<0.001

0.852*

0.728 (0.707, 0.747) [0.853]

-12.0, 3.82

5.69 (5.32, 6.06)

Deurenberg equation

56.76 (6.80)

- 0.34 (-0.55, -0.12)

0.002

0.838*

0.834 (0.818, 0.848) [0.995]

-7.92, 8.60

4.14 (3.85, 4.43)

LBM PE1

58.22 (6.11)

1.12 (0.92, 1.33)

<0.001

0.851*

0.822 (0.806, 0.837) [0.851]

-6.78, 9.02

4.11 (3.80, 4.42)

Women (n = 851)

       

LBM DXA

39.70 (5.30)

      

Heitmann equation

43.74 (5.55)

4.04 (3.83, 4.26)

<0.001

0.833*

0.651 (0.620, 0.680) [0.782]

-10.3, 2.26

5.12 (4.75, 5.49)

Janmahasatian equation

42.50 (5.39)

2.81 (2.60, 3.01)

<0.001

0.837*

0.722 (0.693, 0.749) [0.872]

-8.91, 3.29

4.14 (3.83, 4.45)

Deurenberg equation

40.32 (4.90)

0.63 (0.39, 0.87)

<0.001

0.759*

0.751 (0.721, 0.779) [0.990]

-7.75, 6.49

3.61 (3.29, 3.93)

LBM PE1

39.78 (5.11)

0.08 (-0.12, 0.28)

0.433

0.835*

0.835 (0.813, 0.854) [0.999]

-5.91, 6.07

2.99 (2.74, 3.24)

  1. Mean Error = DXA-PE; LBM, Lean Body Mass; DXA, Dual X-ray absorptiometry; RMSE, Root Mean Square Error; CI, Confidence interval; SD, Standard Deviation; R, Pearson Correlation; Cb = Bias Correction Factor; ρc = Concordance Correlation Coefficient; *p-value <0.001.