Table 1: Summary of studies classified as high quality, aimed at validating SR-20m test for estimating cardiorespiratory fitness in children and adolescents.

♂ = boys; ♀ = girls; CRF: cardiorespiratory fitness; Mean Dif.: mean differences; VO₂max or VO₂peak: maximum oxygen consumption determined by the gold standard measure; r: correlation coefficient; R²: coefficient of explanation; SEE: standard error of estimate; mL/kg/min: relative values of oxygen consumption in milliliters per kilogram of body weight per minute; SR-20m: shuttle run test of 20 meters; ANN: mathematical model based on artificial neural network.