condition mean min max ZT0-3 28.811018 28.811018 28.811018 ZT4-7 36.548588499999994 36.548588499999994 36.548588499999994 ZT8-11 47.1416825 47.1416825 47.1416825 ZT12-15 45.156623499999995 45.156623499999995 45.156623499999995 ZT16-19 49.24823 49.24823 49.24823 ZT20-23 47.479089 47.479089 47.479089