condition mean min max ZT0-3 23.762625 20.55625 26.969 ZT4-7 15.68125 15.68125 15.68125 ZT8-11 16.2772 16.2772 16.2772 ZT12-15 0 0 0 ZT16-19 18.0844 18.0844 18.0844 ZT20-23 21.321350000000002 21.321350000000002 21.321350000000002