condition mean min max ZT0-3 26.5798 26.5798 26.5798 ZT4-7 20.194499999999998 20.194499999999998 20.194499999999998 ZT8-11 21.95375 21.95375 21.95375 ZT12-15 25.4854 25.4854 25.4854 ZT16-19 30.8788 30.8788 30.8788 ZT20-23 28.82395 28.82395 28.82395