condition mean min max ZT0-3 2.5414950000000003 2.5414950000000003 2.5414950000000003 ZT4-7 0.6684225 0.6684225 0.6684225 ZT8-11 0.995587 0.995587 0.995587 ZT12-15 0.165673 0.165673 0.165673 ZT16-19 1.60334 1.60334 1.60334 ZT20-23 3.82941 3.82941 3.82941