The development of reference values for physical fitness is a necessity for the interpretation of screening procedures during growth and development. The investigation conducted by Duran et al. [1] made a noteworthy contribution to the research in one of the most relevant indicators of physical fitness – maximal grip strength (mGS). While incorporating multiple influencing factors such as sex, age, height, and body mass, the authors established novel reference centiles of mGS within the young German population, enabling clinicians and physicians to classify 6 to 24 years-old individuals based on their mGS. They suggested that multiple linear regression could serve as a method for creating multivariable reference centiles involving three explanatory variables.