condition mean min max ZT0-3 54.775666666666666 47.83695 58.874700000000004 ZT4-7 40.239599999999996 40.239599999999996 40.239599999999996 ZT8-11 35.045 35.045 35.045 ZT12-15 73.416325 68.37729999999999 78.45535 ZT16-19 53.4565 53.4565 53.4565 ZT20-23 57.7024 57.7024 57.7024