condition mean min max ZT0-3 11.083079999999999 10.51681 11.64935 ZT4-7 14.31865 14.31865 14.31865 ZT8-11 23.99805 23.99805 23.99805 ZT12-15 0 0 0 ZT16-19 25.22945 25.22945 25.22945 ZT20-23 18.333550000000002 18.333550000000002 18.333550000000002