condition mean min max ZT0-3 63.369615 63.369615 63.369615 ZT4-7 87.946976 87.946976 87.946976 ZT8-11 177.71146 177.71146 177.71146 ZT12-15 131.608679 131.608679 131.608679 ZT16-19 200.37981200000002 200.37981200000002 200.37981200000002 ZT20-23 137.5000425 137.5000425 137.5000425