condition mean min max ZT0-3 0.1565516 0.1565516 0.1565516 ZT4-7 0.073171 0.073171 0.073171 ZT8-11 0.0500015 0.0500015 0.0500015 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0