condition mean min max ZT0-3 1.960013 0.974596 2.94543 ZT4-7 3.607765 3.607765 3.607765 ZT8-11 3.46543 3.46543 3.46543 ZT12-15 0 0 0 ZT16-19 3.242075 3.242075 3.242075 ZT20-23 6.883675 6.883675 6.883675