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Table 3 Linear regression models of physical activity (PA) with markers of fat-free mass (Models I and II)

From: Association of objectively measured physical activity with body components in European adolescents

Fat free massa(Model I) Fat-free massa(Model II) FFMBIAb(Model I) FFMBIAb(Model II)
Males β R 2 P β R 2 P β R 2 P β R 2 P
 Light PAc −0.119 0.475 <0.001 −0.124 0.477 <0.001 −0.093 0.387 0.001 −0.117 0.495 0.001
 Moderate PAc −0.044 0.465 0.083 −0.042 0.466 0.095 −0.059 0.383 <0.05 −0.039 0.485 0.111
Vigorous PAc 0.078 0.469 0.001 0.095 0.473 0.001 −0.026 0.380 0.331 0.063 0.487 <0.05
 MVPAc 0.025 0.464 0.310 0.033 0.465 0.190 −0.041 0.381 0.124 0.016 0.484 0.521
Average PAc 0.046 0.465 0.062 0.054 0.467 <0.05 −0.029 0.381 0.270 0.023 0.484 0.360
Females             
 Light PAc −0.012 0.202 0.678 −0.014 0.263 0.607 0.000 0.174 0.987 −0.007 0.309 0.800
 Moderate PAc 0.014 0.202 0.613 0.025 0.263 0.361 −0.006 0.174 0.846 0.006 0.309 0.832
Vigorous PAc 0.023 0.203 0.405 0.075 0.268 <0.01 −0.015 0.174 0.595 0.057 0.312 <0.05
 MVPAc 0.019 0.202 0.507 0.051 0.265 0.065 −0.015 0.174 0.603 0.028 0.310 0.293
 Average PAc 0.042 0.204 0.142 0.07 0.267 <0.05 0.009 0.174 0.755 0.048 0.311 0.077
  1. Model I includes adjustment for pubertal status, family affluence scale and country.
  2. Model II includes adjustment for model I + skinfold thickness.
  3. β, standardized regression coefficients; R 2, coefficients of determination.
  4. BMI indicates body mass index, MVPA indicates moderate and vigorous PA.
  5. aDerived from Slaughter equation [26], bderived from bioimpedance [29], ctransformed data.