condition mean min max ZT0-3 0.0383053205 0.0 0.076610641 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 0.0 0.0 0.0 ZT20-23 0.04974901616666667 0.0 0.09949803233333333