condition mean min max ZT0-3 10.5123792825 8.44698919 12.577769374999999 ZT4-7 3.210191601 2.5607853523333333 3.8595978496666667 ZT8-11 4.968244053333333 4.692075861666666 5.2444122449999995 ZT12-15 6.819135531500001 5.168244292000001 8.470026771 ZT16-19 8.982117029166668 6.6903472850000005 11.273886773333334 ZT20-23 11.817794049666666 8.467470359333333 15.16811774