condition mean min max ZT0-3 47.05 47.05 47.05 ZT4-7 9.9 9.9 9.9 ZT8-11 20.849999999999998 20.849999999999998 20.849999999999998 ZT12-15 15.05 15.05 15.05 ZT16-19 13.35 13.35 13.35 ZT20-23 23.549999999999997 23.549999999999997 23.549999999999997