condition mean min max ZT0-3 6.76125 6.70502 6.81748 ZT4-7 3.858 3.858 3.858 ZT8-11 5.509895 5.509895 5.509895 ZT12-15 0 0 0 ZT16-19 5.691425 5.691425 5.691425 ZT20-23 5.338135 5.338135 5.338135