condition mean min max ZT0-3 19.900750000000002 19.900750000000002 19.900750000000002 ZT4-7 13.49765 13.49765 13.49765 ZT8-11 12.50785 12.50785 12.50785 ZT12-15 18.09325 18.09325 18.09325 ZT16-19 26.01325 26.01325 26.01325 ZT20-23 21.74825 21.74825 21.74825