condition mean min max ZT0-3 54.0718664275 21.10975879 87.033974065 ZT4-7 175.443657175 159.9555479 190.93176645 ZT8-11 111.167989855 86.70472796 135.63125175 ZT12-15 26.6776610725 20.20934869 33.145973455000004 ZT16-19 26.9009297325 26.745191675 27.05666779 ZT20-23 20.809305100000003 18.309183 23.309427200000002