condition mean min max ZT0-3 2.4779825 2.4698599999999997 2.4861050000000002 ZT4-7 0.662504 0.662504 0.662504 ZT8-11 0.5878275 0.5878275 0.5878275 ZT12-15 0 0 0 ZT16-19 2.4765449999999998 2.4765449999999998 2.4765449999999998 ZT20-23 2.2472250000000003 2.2472250000000003 2.2472250000000003