condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 1.780865 1.780865 1.780865 ZT20-23 3.572635 3.572635 3.572635