condition mean min max ZT0-3 26.973200000000002 26.3686 27.577800000000003 ZT4-7 22.0664 22.0664 22.0664 ZT8-11 17.97795 17.97795 17.97795 ZT12-15 0 0 0 ZT16-19 26.807699999999997 26.807699999999997 26.807699999999997 ZT20-23 26.249200000000002 26.249200000000002 26.249200000000002