condition mean min max ZT0-3 16.381876335 14.06640992 18.69734275 ZT4-7 15.0951467925 11.885624915000001 18.304668669999998 ZT8-11 23.539002822500002 21.00748224 26.070523405 ZT12-15 13.11829473925 9.111755093 17.1248343855 ZT16-19 11.836806875 10.984898515000001 12.688715235 ZT20-23 14.414907852499999 14.019905484999999 14.809910219999999