condition mean min max ZT0-3 0.22563963333333334 0.1192474 0.400807 ZT4-7 3.3083299999999998 3.3083299999999998 3.3083299999999998 ZT8-11 1.637245 1.637245 1.637245 ZT12-15 0.59628875 0.24680449999999998 0.945773 ZT16-19 0.4423155 0.4423155 0.4423155 ZT20-23 0.08347585 0.08347585 0.08347585