condition mean min max ZT0-3 0.720736 0.6226775 0.8187945 ZT4-7 1.24364 1.24364 1.24364 ZT8-11 0.475186 0.475186 0.475186 ZT12-15 0 0 0 ZT16-19 0.9605035 0.9605035 0.9605035 ZT20-23 1.0965235 1.0965235 1.0965235