condition mean min max ZT0-3 1.0945881666666666 0.511765 1.7763399999999998 ZT4-7 0.9433805000000001 0.9433805000000001 0.9433805000000001 ZT8-11 0.742272 0.742272 0.742272 ZT12-15 1.5903735 1.2149640000000002 1.9657829999999998 ZT16-19 1.6221225 1.6221225 1.6221225 ZT20-23 0.963311 0.963311 0.963311