condition mean min max ZT0-3 0.008163 0.008163 0.008163 ZT4-7 0.0042583249999999994 0.0042583249999999994 0.0042583249999999994 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0058005750000000005 0.0058005750000000005 0.0058005750000000005 ZT16-19 0.005955441666666667 0.005955441666666667 0.005955441666666667 ZT20-23 0.0047932 0.0047932 0.0047932