condition mean min max ZT0-3 60.834333333333326 46.49905 71.28155 ZT4-7 38.413650000000004 38.413650000000004 38.413650000000004 ZT8-11 44.73905 44.73905 44.73905 ZT12-15 65.61282499999999 62.08 69.14564999999999 ZT16-19 81.3013 81.3013 81.3013 ZT20-23 80.26055 80.26055 80.26055