condition mean min max ZT0-3 0.0343915 0.0 0.068783 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.04578083333333333 0.0 0.09156166666666667 ZT20-23 0 0 0