condition mean min max ZT0-3 1.3157885 1.1876820000000001 1.443895 ZT4-7 1.9979 1.9979 1.9979 ZT8-11 1.6455449999999998 1.6455449999999998 1.6455449999999998 ZT12-15 0 0 0 ZT16-19 2.02608 2.02608 2.02608 ZT20-23 2.13918 2.13918 2.13918