condition mean min max ZT0-3 30.374455165 20.04902978 40.69988055 ZT4-7 74.9353379275 71.951360045 77.91931581 ZT8-11 81.70226304250001 77.15570725 86.24881883500001 ZT12-15 62.018231045 48.893074365000004 75.143387725 ZT16-19 62.633550889999995 57.6057893 67.66131247999999 ZT20-23 70.23695122250001 63.42062147 77.053280975