condition mean min max ZT0-3 137.908121 137.908121 137.908121 ZT4-7 154.022976 154.022976 154.022976 ZT8-11 198.93292350000002 198.93292350000002 198.93292350000002 ZT12-15 175.43046950000002 175.43046950000002 175.43046950000002 ZT16-19 175.036653 175.036653 175.036653 ZT20-23 165.88787250000001 165.88787250000001 165.88787250000001