condition mean min max ZT0-3 0.5115752499999999 0.41872149999999997 0.604429 ZT4-7 0.6462835 0.6462835 0.6462835 ZT8-11 0.30538600000000005 0.30538600000000005 0.30538600000000005 ZT12-15 0 0 0 ZT16-19 0.4117905 0.4117905 0.4117905 ZT20-23 0.300623 0.300623 0.300623