condition mean min max ZT0-3 0.325406 0.325406 0.325406 ZT4-7 0.0387547 0.0387547 0.0387547 ZT8-11 0.024610899999999998 0.024610899999999998 0.024610899999999998 ZT12-15 0.0298927 0.0298927 0.0298927 ZT16-19 0.0455722 0.0455722 0.0455722 ZT20-23 0.499208 0.499208 0.499208