condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 5.448155 5.448155 5.448155 ZT12-15 2.43683 0.0 4.87366 ZT16-19 5.08005 5.08005 5.08005 ZT20-23 2.866535 2.866535 2.866535