condition mean min max ZT0-3 222.67047820000002 205.74862480000002 239.59233160000002 ZT4-7 130.4094524925 108.599437285 152.2194677 ZT8-11 70.58776183750001 67.23858139000001 73.936942285 ZT12-15 51.6313946225 51.614793004999996 51.64799624 ZT16-19 57.21205623 49.573451115 64.850661345 ZT20-23 91.1457962175 89.553980115 92.73761232000001