condition mean min max ZT0-3 29.777664 29.777664 29.777664 ZT4-7 30.505182 30.505182 30.505182 ZT8-11 29.036382500000002 29.036382500000002 29.036382500000002 ZT12-15 27.722945 27.722945 27.722945 ZT16-19 28.6931625 28.6931625 28.6931625 ZT20-23 27.308836999999997 27.308836999999997 27.308836999999997