Table 1

Body composition analysis by hydrodensitometry and whole body air displacement plethysmography and respective estimates of precision

HydrodensitometryPlethysmography
Mean (SD)PrecisionMean (SD)Precision
Children (n = 22)
 Body volume (litres)31.77 (7.39)0.12931.82 (7.39)0.072
 Body density (kg/l)1.045 (0.018)0.00421.044 (0.016)0.0024
 Percentage body fat (%)19.2 (8.7)2.0519.9 (7.7)1.15
 Fat mass (kg)6.7 (4.2)0.686.9 (4.0)0.38
Adults (n = 10)
 Body volume (litres)59.4 (5.9)0.14858.8 (5.9)0.071
 Body density (kg/l)1.046 (0.019)0.00281.053 (0.022)0.0011
 Percentage body fat (%)23.5 (8.8)1.2820.2 (9.6)0.50
 Fat mass (kg)14.5 (5.3)0.7412.4 (5.7)0.30
  • Precision was calculated by dividing the standard deviation of differences between duplicate measurements (SH or SP) by √–2.