condition mean min max ZT0-3 26.574767245000004 23.69148213 29.458052360000003 ZT4-7 46.8307945575 44.873021285 48.788567830000005 ZT8-11 49.762422834999995 48.56695927 50.95788639999999 ZT12-15 48.02673073 33.836682735 62.216778725 ZT16-19 73.45827842 70.310451925 76.606104915 ZT20-23 40.47918514 28.93974798 52.018622300000004