condition mean min max ZT0-3 9.45594 9.45594 9.45594 ZT4-7 6.199925 6.199925 6.199925 ZT8-11 5.58065 5.58065 5.58065 ZT12-15 6.650145 6.650145 6.650145 ZT16-19 10.583649999999999 10.583649999999999 10.583649999999999 ZT20-23 10.30155 10.30155 10.30155