Physical fitness performance at baseline and end-of-study survey among 219 schoolchildren, stratified by sex. A: VO2 max estimates from the 20 m shuttle run test. B: Jumping distance from the standing broad jump test. C: Hand grip strength. Included are performances of 219 children (112 girls, 107 boys) who had complete baseline data (December 2012) and end-of-study data (May 2013). Box plot: boxes illustrate the 25th and 75th percentiles (ptile), while the whiskers indicate the adjacent lower and upper values (most extreme values which are within 25th ptile −1.5*(75th-25th ptile) and 75th ptile + 1.5*(75th-25th ptile), respectively). The median is shown by the line within the boxes and outliers are indicated with dots.