condition mean min max ZT0-3 23.22791666666667 19.74425 26.450400000000002 ZT4-7 28.5655 28.5655 28.5655 ZT8-11 61.7661 61.7661 61.7661 ZT12-15 64.497625 52.98765 76.0076 ZT16-19 40.49995 40.49995 40.49995 ZT20-23 41.69345 41.69345 41.69345