condition mean min max ZT0-3 29.50775 29.50775 29.50775 ZT4-7 20.37295 20.37295 20.37295 ZT8-11 18.08215 18.08215 18.08215 ZT12-15 20.7877 20.7877 20.7877 ZT16-19 25.47845 25.47845 25.47845 ZT20-23 32.12045 32.12045 32.12045