condition mean min max ZT0-3 0.42688675 0.391035 0.4627385 ZT4-7 0.45608799999999994 0.45608799999999994 0.45608799999999994 ZT8-11 0.329137 0.329137 0.329137 ZT12-15 0 0 0 ZT16-19 0.415113 0.415113 0.415113 ZT20-23 0.185595 0.185595 0.185595