condition mean min max ZT0-3 173.479561 173.479561 173.479561 ZT4-7 141.8752365 141.8752365 141.8752365 ZT8-11 190.9479795 190.9479795 190.9479795 ZT12-15 119.59831199999999 119.59831199999999 119.59831199999999 ZT16-19 187.950525 187.950525 187.950525 ZT20-23 202.3920605 202.3920605 202.3920605