Table 2: Summary of studies classified as high quality, aimed at validating other tests for estimating cardiorespiratory fitness in children and adolescents.

♂ = boys; ♀ = girls; CRF: cardiorespiratory fitness; Mean Dif.: mean differences; VO₂ max or VO₂ peak: maximum oxygen consumption determined by the gold standard measure; r: correlation coefficient; R²: coefficient of explanation; SEE: standard error of estimate; TE: total error; mL/kg/min: relative values of oxygen consumption in milliliters per kilogram of body weight per minute; CCI: confidence interval; CV: coefficient of variation.