condition mean min max ZT0-3 3.6632525 3.576775 3.74973 ZT4-7 4.269769999999999 4.269769999999999 4.269769999999999 ZT8-11 3.118525 3.118525 3.118525 ZT12-15 0 0 0 ZT16-19 4.130155 4.130155 4.130155 ZT20-23 4.181955 4.181955 4.181955