condition mean min max ZT0-3 0.072629 0.0 0.217887 ZT4-7 0.1106945 0.1106945 0.1106945 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.1225365 0.1225365 0.1225365