condition mean min max ZT0-3 0.022421575 0.0 0.04484315 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.08825745 0.08825745 0.08825745 ZT20-23 0.04453715 0.04453715 0.04453715