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Table 7 Body composition in healthy women split into two groups based on the Index of Fat Mass (IFM)

From: Influence of lean and fat mass on bone mineral density and on urinary stone risk factors in healthy women

  Group C Group D p (*) p critical value (0.0036 < p < 0.0025)
Low fat mass High fat mass
IFM < 3.28 IFM > 3.28
N. 39 N. 39
IFM 2.50 ± 0.42 5.14 ± 4.03 <0.0001 ###
Age, years 45 ± 6 47 ± 6 0.23  
Menopause, n., % (°) 8 (21) 11 (28) 0.429**  
Years from menopause 0.8 ± 3 1.5 ± 3 0.336  
Weight, Kg 60 ± 7 73 ± 10 <0.0001 ###
Height, cm 161 ± 6 161 ± 6 0.467  
BMI, Kg/m2 23 ± 2 28 ± 3 <0.0001 ###
Total trunk mass, Kg 28 ± 4 35 ± 6 <0.0001 ###
Total lower limb mass, Kg 21 ± 3 25 ± 3 <0.0001 ###
Total lean mass, Kg 41 ± 5 43 ± 5 0.064  
Total fat mass, Kg 17 ± 3 27 ± 5 <0.0001 ###
BMD upper limbs, g/cm2 0.74 ± 0.08 0.73 ± 0.06 0.347  
BMD ribs, g/cm2 0.66 ± 0.08 0.66 ± 0.07 0.886  
BMD lower limbs, g/cm2 1.13 ± 0.09 1.13 ± 0.09 0.896  
BMD pelvis, g/cm2 1.18 ± 0.15 1.27 ± 0.17 0.013  
BMD lumbar vertebrae, g/cm2 0.98 ± 0.13 1.06 ± 0.14 0.018  
BMD femur, g/cm2 0.90 ± 0.10 0.96 ± 0.12 0.025  
T-score lumbar vertebrae (+) −0.55 (−2.54 – 2.87) 0.25 (−2.50 – 2.68) 0.013***  
Z-score lumbar vertebrae (+) −0.13 (−1.92 – 3.19) 0.63 (−1.46 – 3.21) 0.004***  
T-score femur (+) −0.52 (−1.55 – 1.25) 0.24 (−1.92 – 2–07) 0.034***  
Z-score femur (+) −0.18 (−1.27 – 1.93) 0.61 (−1.52 – 2.43) 0.014***  
  1. Data were reported as mean ± standard deviation (SD), unless otherwise specified.
  2. °Data were reported as number of patients (frequency).
  3. + Data were reported as median and range.
  4. *p value was calculated with independent Student’s t-test, unless otherwise specified.
  5. **χ2 test was applied to evaluate p value.
  6. ***Mann-Whitney’s u-test was applied to evaluate p-value.
  7. ###Significant differences with p adjusted by Holm’s test.
  8. BMD: Bone Mineral Density.