condition mean min max ZT0-3 2.49435919525 0.459164843 4.5295535475 ZT4-7 12.724843057000001 9.357830999 16.091855115 ZT8-11 22.679118142500002 19.97740753 25.380828755000003 ZT12-15 16.70010922475 13.4687108995 19.93150755 ZT16-19 13.63170420975 11.7168155715 15.546592848 ZT20-23 13.1245140665 10.815326808 15.433701325