condition mean min max ZT0-3 54.06308333333333 49.9542 61.27825 ZT4-7 39.863550000000004 39.863550000000004 39.863550000000004 ZT8-11 19.472 19.472 19.472 ZT12-15 24.748525 20.95715 28.5399 ZT16-19 31.357100000000003 31.357100000000003 31.357100000000003 ZT20-23 41.5526 41.5526 41.5526