condition mean min max ZT0-3 2.5612325 2.18885 2.9336149999999996 ZT4-7 3.217425 3.217425 3.217425 ZT8-11 2.47953 2.47953 2.47953 ZT12-15 0 0 0 ZT16-19 3.744215 3.744215 3.744215 ZT20-23 3.307225 3.307225 3.307225