condition mean min max ZT0-3 18.342624999999998 17.52495 19.1603 ZT4-7 20.31655 20.31655 20.31655 ZT8-11 22.958550000000002 22.958550000000002 22.958550000000002 ZT12-15 0 0 0 ZT16-19 29.1152 29.1152 29.1152 ZT20-23 24.0275 24.0275 24.0275