condition mean min max ZT0-3 56.4627 46.79155 66.13385 ZT4-7 6.58832 6.58832 6.58832 ZT8-11 2.586825 2.586825 2.586825 ZT12-15 0 0 0 ZT16-19 12.536975 12.536975 12.536975 ZT20-23 17.84645 17.84645 17.84645