condition mean min max ZT0-3 0.45635325 0.41870399999999997 0.4940025 ZT4-7 0.1066159 0.1066159 0.1066159 ZT8-11 0.3179825 0.3179825 0.3179825 ZT12-15 0 0 0 ZT16-19 0.3811905 0.3811905 0.3811905 ZT20-23 0.10446985 0.10446985 0.10446985