condition mean min max ZT0-3 9.377105643 2.496896401 16.257314885 ZT4-7 24.4740824625 24.42468617 24.523478755 ZT8-11 16.17100053 15.36097209 16.98102897 ZT12-15 17.103399727499998 13.23481602 20.971983435 ZT16-19 28.199745812499998 26.870217359999998 29.529274265 ZT20-23 26.5162019925 24.12222525 28.910178735