condition mean min max ZT0-3 178.085894 178.085894 178.085894 ZT4-7 77.4709165 77.4709165 77.4709165 ZT8-11 149.1157505 149.1157505 149.1157505 ZT12-15 278.8368755 278.8368755 278.8368755 ZT16-19 231.91117300000002 231.91117300000002 231.91117300000002 ZT20-23 386.5085285 386.5085285 386.5085285