condition mean min max ZT0-3 212.043512 212.043512 212.043512 ZT4-7 317.2612355 317.2612355 317.2612355 ZT8-11 314.360011 314.360011 314.360011 ZT12-15 260.473881 260.473881 260.473881 ZT16-19 211.4736735 211.4736735 211.4736735 ZT20-23 230.720308 230.720308 230.720308