condition mean min max ZT0-3 0.0113661 0.0113661 0.0113661 ZT4-7 0.01581905 0.01581905 0.01581905 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.06900105000000001 0.06900105000000001 0.06900105000000001 ZT20-23 0.06819975 0.06819975 0.06819975