condition mean min max ZT0-3 0.6142115 0.6142115 0.6142115 ZT4-7 0.4647805 0.4647805 0.4647805 ZT8-11 0.5976619999999999 0.5976619999999999 0.5976619999999999 ZT12-15 1.341694 1.341694 1.341694 ZT16-19 1.64967 1.64967 1.64967 ZT20-23 1.0478105 1.0478105 1.0478105