condition mean min max ZT0-3 14.4727193325 10.811333475000001 18.13410519 ZT4-7 11.681431538750001 10.7245117575 12.63835132 ZT8-11 13.1899432475 13.142564135 13.23732236 ZT12-15 12.61876980475 11.837274615 13.4002649945 ZT16-19 12.74568772125 10.7209345575 14.770440885 ZT20-23 19.9428552625 18.153227415 21.73248311