Table 2.
– Descriptive Statistics and Composition Data for the NHANES Dataset by Gender.
| All (n=5884) |
Male (n=3063) |
Female (n=2821) |
P-value | |
|---|---|---|---|---|
| Age, years | 31.2 ± 10.1 | 30.8 ± 10.0 | 31.6 ± 10.2 | 0.007 |
| Weight, kg | 76.1 ± 17.0 | 80.8 ± 15.9 | 71.1 ± 16.6 | <0.0001 |
| Height, cm | 168.7 ± 9.7 | 174.9 ± 7.6 | 161.9 ± 6.8 | <0.0001 |
| BMI, kg/m2 | 26.7 ± 5.4 | 26.4 ± 4.7 | 27.1 ± 6.0 | <0.0001 |
| DXA | ||||
| DXALST, kg | 49.9 ± 11.3 | 57.6 ± 8.7 | 41.5 ± 6.9 | <0.0001 |
| DXAFFM, kg | 52.3 ± 11.6 | 60.3 ± 9.0 | 43.7 ± 7.1 | <0.0001 |
| DXAFM, kg | 24.6 ± 10.3 | 21.3 ± 8.7 | 28.1 ± 10.7 | <0.0001 |
| BIS | ||||
| RE, Ω | 645 ± 96 | 597 ± 74 | 697 ± 91 | <0.0001 |
| RI, Ω | 1281 ± 322 | 1087±206 | 1491 ±292 | <0.0001 |
| ECWMoissl, L | 15.8 ± 3.2 | 17.7 ± 2.7 | 13.8 ± 2.3 | <0.0001 |
| ICWMoissl, L | 22.3 ± 5.1 | 26.1 ± 3.7 | 18.2 ± 2.7 | <0.0001 |
| Chamney model | ||||
| ExF, kg | −0.3 ± 1.0 | −0.3 ± 1.1 | −0.3 ± 0.9 | 0.003 |
| NHLT, kg | 46.2 ± 12.3 | 55.6 ± 8.5 | 35.9 ± 5.7 | <0.0001 |
| NHAT, kg | 30.2 ± 16.3 | 25.5 ± 14.6 | 35.4 ± 16.4 | <0.0001 |
| FMChamney, kg | 22.8 ± 12.3 | 19.2 ± 11.0 | 26.7 ± 12.4 | <0.0001 |
Abbreviations: BMI, body mass index; BIS, bioimpedance spectroscopy; RE and RI are Cole model terms: RE, resistance of extracellular water; RI, resistance of intracellular water; ECW, extra cellular water; ICW, intracellular water; Chamney model compartments (derived by applying bioimpedance spectroscopy (BIS)-generated BMI-corrected ECWMoissl and ICWMoissl to Chamney model equations): ExF, extracellular fluid; NHLT, normally-hydrated lean tissue; NHAT, normally-hydrated adipose tissue; FM, fat mass; DXA, dual energy X-ray absorptiometry; LST, lean soft tissue; RYGB, Roux-en-Y gastric bypass. Sample values are mean ± SD (range); male and female values are mean ± SD.
P-values are comparison between males and females by student’s t-test.