condition mean min max ZT0-3 144.07533333333333 118.739 170.061 ZT4-7 82.84479999999999 82.84479999999999 82.84479999999999 ZT8-11 9.85812 9.85812 9.85812 ZT12-15 3.650135 3.2586000000000004 4.04167 ZT16-19 5.8755299999999995 5.8755299999999995 5.8755299999999995 ZT20-23 20.91875 20.91875 20.91875