condition mean min max ZT0-3 7.019015957500001 2.899298008 11.138733907 ZT4-7 38.543367607499995 29.131727844999997 47.95500737 ZT8-11 58.9025658575 54.69837036 63.106761355 ZT12-15 17.597046921999997 4.8469165795 30.347177264499997 ZT16-19 2.98360184425 2.4623061815000002 3.504897507 ZT20-23 1.02926688575 0.8970914365 1.161442335