condition mean min max ZT0-3 102.634525 102.634525 102.634525 ZT4-7 140.26722949999998 140.26722949999998 140.26722949999998 ZT8-11 136.91743350000002 136.91743350000002 136.91743350000002 ZT12-15 122.67830850000001 122.67830850000001 122.67830850000001 ZT16-19 114.8902765 114.8902765 114.8902765 ZT20-23 114.763067 114.763067 114.763067