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Table 3 Regression coefficients β from multiple linear regression models for serum myostatin and IGF-1 after adjustment for age

From: Serum reference value of two potential doping candidates—myostatin and insulin-like growth factor-I in the healthy young male

  Myostatin (ng/ml) IGF-1 (ng/ml)
Groupa −0.918 ± 0.927 (0.326) 38.3 ± 27.4 (0.169)
Height (cm) 0.051 ± 0.058 (0.377) 3.503 ± 1.673 (0.041)*
Weight (kg) −0.042 ± 0.029 (0.149) 1.169 ± 0.869 (0.184)
BMI (kg/m2) −0.269 ± 0.111 (0.018)* 1.797 ± 3.476 (0.607)
Fat mass (%) −0.141 ± 0.058 (0.018)* 0.695 ± 1.824 (0.705)
Fat-free mass (kg) −0.014 ± 0.052 (0.789) 2.673 ± 1.524 (0.085)
Muscle mass (kg) −0.033 ± 0.092 (0.723) 3.502 ± 2.717 (0.203)
Waist girth (cm) −0.085 ± 0.043 (0.050)* 0.480 ± 1.333 (0.720)
Grip strength (kg) −0.019 ± 0.078 (0.811) 3.229 ± 2.297 (0.166)
Estimated daily energy expenditure (kcal/day) −0.001 ± 0.000 (0.125) 0.025 ± 0.013 (0.051)
IGF-1 (ng/ml) 0.001 ± 0.005 (0.883) -
myostatin (ng/ml) - 0.600 ± 4.072 (0.883)
  1. Data are expressed as β ± standard error (p value)
  2. *: p <0.05
  3. a: Control group is 0; athlete group is 1