condition mean min max ZT0-3 0.16834905 0.10140945 0.23528865 ZT4-7 0.340679 0.340679 0.340679 ZT8-11 0.40566599999999997 0.40566599999999997 0.40566599999999997 ZT12-15 0 0 0 ZT16-19 0.5318625 0.5318625 0.5318625 ZT20-23 0.2336065 0.2336065 0.2336065