condition mean min max ZT0-3 1.1441468333333333 1.0610915 1.1926785 ZT4-7 0.992727 0.992727 0.992727 ZT8-11 0.9872675 0.9872675 0.9872675 ZT12-15 0.69289075 0.643826 0.7419555 ZT16-19 0.0 0.0 0.0 ZT20-23 0.625765 0.625765 0.625765