condition mean min max ZT0-3 34.49581666666667 26.897750000000002 39.5203 ZT4-7 30.033450000000002 30.033450000000002 30.033450000000002 ZT8-11 40.725049999999996 40.725049999999996 40.725049999999996 ZT12-15 72.685725 59.588300000000004 85.78315 ZT16-19 67.479 67.479 67.479 ZT20-23 49.28035 49.28035 49.28035