condition mean min max ZT0-3 9.356472499999999 8.384979999999999 10.327964999999999 ZT4-7 11.33344 11.33344 11.33344 ZT8-11 18.09815 18.09815 18.09815 ZT12-15 0 0 0 ZT16-19 21.646050000000002 21.646050000000002 21.646050000000002 ZT20-23 19.9296 19.9296 19.9296