condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0597865 0.0597865 0.0597865 ZT8-11 0.0653805 0.0653805 0.0653805 ZT12-15 0.238485 0.238485 0.238485 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0261147 0.0261147 0.0261147