condition mean min max ZT0-3 0.0329905 0.0 0.0989715 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.052918 0.0 0.105836 ZT16-19 0.0 0.0 0.0 ZT20-23 0.1042865 0.1042865 0.1042865