condition mean min max ZT0-3 9.51825335525 4.632767669 14.4037390415 ZT4-7 37.0484812925 32.929798435 41.16716415 ZT8-11 33.425762025 32.83886844 34.01265561 ZT12-15 71.31595443500001 64.097233695 78.534675175 ZT16-19 111.09394874750001 104.730642595 117.45725490000001 ZT20-23 103.33372766 101.43091182 105.2365435