condition mean min max ZT0-3 189.680828 189.680828 189.680828 ZT4-7 67.66262599999999 67.66262599999999 67.66262599999999 ZT8-11 53.169203499999995 53.169203499999995 53.169203499999995 ZT12-15 80.186737 80.186737 80.186737 ZT16-19 48.552845000000005 48.552845000000005 48.552845000000005 ZT20-23 50.268440999999996 50.268440999999996 50.268440999999996