condition mean min max ZT0-3 44.892607 44.892607 44.892607 ZT4-7 51.389388499999995 51.389388499999995 51.389388499999995 ZT8-11 33.0541165 33.0541165 33.0541165 ZT12-15 35.858417 35.858417 35.858417 ZT16-19 25.771908500000002 25.771908500000002 25.771908500000002 ZT20-23 30.2664695 30.2664695 30.2664695