condition mean min max ZT0-3 26.12995 23.661700000000003 28.5982 ZT4-7 18.34845 18.34845 18.34845 ZT8-11 20.06885 20.06885 20.06885 ZT12-15 0 0 0 ZT16-19 19.73505 19.73505 19.73505 ZT20-23 22.447000000000003 22.447000000000003 22.447000000000003