condition mean min max ZT0-3 29.1571290495 12.423825708999999 45.89043239 ZT4-7 17.469335594999997 11.823220945 23.115450244999998 ZT8-11 32.064437670000004 29.74650648 34.38236886 ZT12-15 22.110174750000002 19.157403045000002 25.062946455000002 ZT16-19 19.875893255 19.422917255 20.328869255 ZT20-23 23.584669535 23.44052245 23.72881662