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Table 3 Stepwise multiple linear regression analysis predicting ACSA of quadriceps femoris

From: Anatomical cross-sectional area of the quadriceps femoris and sit-to-stand test score in middle-aged and elderly population: development of a predictive equation

Independent variables Multiple regression equation R R 2 P
Step 1
X 1: STS power with kept upright ACSA = 13.41 + 0.14X 1 0.67 0.44 <0.001
Step 2
X 1: STS power with kept upright ACSA = 25.86 + 0.10X 1 − 9.68X 2 0.76 0.59 <0.001
X 2: sex (males, 0; females, 1)     
Step 3     
X 1: STS power with kept upright ACSA = 54.55 + 0.07X 1 − 11.66X 2 − 0.343X 3 0.80 0.64 <0.001
X 2: sex     
X 3: age     
  1. ACSA anatomical cross-sectional area, STS sit-to-stand