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Table 5 Comparison of the results of FFMDXA and FFMBIA for different %BF subgroupsa

From: Predicting body composition using foot-to-foot bioelectrical impedance analysis in healthy Asian individuals

Female: BF%DXA <20 % (n = 20) 20 % - 30 % (n = 80) 30 %-40 % (n = 94) >40 % (n = 61) Total (n = 257)
FFMDXA (kg) 41.8 ± 3.8 41.8 ± 5.2 38.4 ± 4.7 40.9 ± 6.9 40.3 ± 5.6
  (35, 48) (29, 52) (29, 51) (30, 58) (29, 58)
FFMBIA (kg) 39.2 ± 3.6 40.3 ± 4.7 38.9 ± 4.4 42.9 ± 6.7 40.3 ± 5.2
  (32, 45) (29, 51) (28, 51) (31, 60) (28, 59)
Bias ± SDb (kg) −2.6 ± 1.7 −1.5 ± 2.8 0.5 ± 2.7 2.0 ± 2.9 0.0 ± 3.0
r,c 0.90 0.91 0.89 0.94 0.87
P ,d 0.04* 0.06 0.43 0.11 0.92
Slope,e 0.86 0.83 0.79 0.89 0.79
Intercept,e 3.17 5.34 9.77 6.70 8.41
Male: BF%DXA <10 % (n = 46) 10 % - 20 % (n = 96) 20 % - 30 % (n = 104) >30 % (n = 51) Total (n = 297)
FFMDXA(kg) 60.9 ± 5.2 58.6 ± 7.0 58.2 ± 7.9 57.9 ± 7.7 50.1 ± 11.4
  (47, 71) (33, 76) (46, 86) (46, 77) (33, 86)
FFMBIA(kg) 58.6 ± 3.8 58.1 ± 5.3 58.6 ± 6.7 60.0 ± 7.4 50.0 ± 10.9
  (52, 67) (39, 74) (48, 79) (47, 79) (40, 79.2)
Bias ± SDb(kg) −2.3 ± 2.5 −0.5 ± 3.2 0.4 ± 3.1 2.1 ± 3.2 0.0 ± 3.2
r,c 0.89 0.90 0.93 0.91 0.89
P ,d 0.02* 0.59 0.68 0.16 0.97
Slopee 0.65 0.68 0.79 0.87 0.70
Intercepte 19.13 18.52 12.71 9.60 17.41
  1. aAll values are mean ± SD; minimum and maximum in parentheses
  2. bThe biases and standard deviations between FFMDXA and FFMBIA indifferent subgroups
  3. cThe correlation coefficients of FFMDXA and FFMBIA in different subgroups
  4. dThe results of paired t-tests between FFMDXA and FFMBIA indifferent subgroups
  5. eThe slopes and intercepts of the regression model of FFMDXA and FFMBIA indifferent subgroups
  6. *Denotes significantly different at the .05 level