condition mean min max ZT0-3 35.22611666666667 13.075050000000001 51.63825 ZT4-7 11.62892 11.62892 11.62892 ZT8-11 44.48095 44.48095 44.48095 ZT12-15 84.97385 71.38005000000001 98.56765 ZT16-19 71.71340000000001 71.71340000000001 71.71340000000001 ZT20-23 71.55709999999999 71.55709999999999 71.55709999999999