condition mean min max ZT0-3 0.07669686325 0.0 0.1533937265 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 0.0073378695 0.0 0.014675739 ZT20-23 0.021061455166666666 0.0 0.04212291033333333