condition mean min max ZT0-3 7.16005 5.952529999999999 9.5367 ZT4-7 4.9635 4.9635 4.9635 ZT8-11 2.106645 2.106645 2.106645 ZT12-15 2.0943074999999998 2.000965 2.1876499999999997 ZT16-19 2.09917 2.09917 2.09917 ZT20-23 4.241675 4.241675 4.241675