condition mean min max ZT0-3 0.3705805 0.3705805 0.3705805 ZT4-7 0.8549629999999999 0.8549629999999999 0.8549629999999999 ZT8-11 0.3443425 0.3443425 0.3443425 ZT12-15 0.06806375 0.06806375 0.06806375 ZT16-19 0.0687525 0.0687525 0.0687525 ZT20-23 0.2061165 0.2061165 0.2061165