condition mean min max ZT0-3 0.5021675 0.5021675 0.5021675 ZT4-7 0.10579585 0.10579585 0.10579585 ZT8-11 0.1783835 0.1783835 0.1783835 ZT12-15 45.30325 45.30325 45.30325 ZT16-19 26.318849999999998 26.318849999999998 26.318849999999998 ZT20-23 9.468879999999999 9.468879999999999 9.468879999999999