condition mean min max ZT0-3 0.0329149 0.0329149 0.0329149 ZT4-7 0.0 0.0 0.0 ZT8-11 0.01242705 0.01242705 0.01242705 ZT12-15 0.0 0.0 0.0 ZT16-19 0.02009645 0.02009645 0.02009645 ZT20-23 0.039534650000000005 0.039534650000000005 0.039534650000000005