condition mean min max ZT0-3 0.020703166666666665 0.0150081 0.031109449999999997 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0235973 0.0 0.0471946 ZT16-19 0.0 0.0 0.0 ZT20-23 0.01625015 0.01625015 0.01625015