condition mean min max ZT0-3 0.36539499999999997 0.36539499999999997 0.36539499999999997 ZT4-7 0.1949184 0.1949184 0.1949184 ZT8-11 0.265216 0.265216 0.265216 ZT12-15 0.8225005 0.8225005 0.8225005 ZT16-19 0.5959325 0.5959325 0.5959325 ZT20-23 1.0766885 1.0766885 1.0766885