condition mean min max ZT0-3 0.010715522 0.0 0.021431044 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.02300511 0.0 0.04601022