condition mean min max ZT0-3 33.9529 29.81725 38.08855 ZT4-7 15.63805 15.63805 15.63805 ZT8-11 17.285200000000003 17.285200000000003 17.285200000000003 ZT12-15 0 0 0 ZT16-19 25.06805 25.06805 25.06805 ZT20-23 27.831000000000003 27.831000000000003 27.831000000000003