condition mean min max ZT0-3 15.996099 15.996099 15.996099 ZT4-7 17.072418499999998 17.072418499999998 17.072418499999998 ZT8-11 57.793273500000005 57.793273500000005 57.793273500000005 ZT12-15 49.531772000000004 49.531772000000004 49.531772000000004 ZT16-19 157.1797585 157.1797585 157.1797585 ZT20-23 155.407821 155.407821 155.407821