condition mean min max ZT0-3 3.5228325 2.5207699999999997 4.524895 ZT4-7 3.34269 3.34269 3.34269 ZT8-11 3.9563 3.9563 3.9563 ZT12-15 0 0 0 ZT16-19 5.06265 5.06265 5.06265 ZT20-23 2.83344 2.83344 2.83344