condition mean min max ZT0-3 0.01645745 0.01645745 0.01645745 ZT4-7 0.04572135 0.04572135 0.04572135 ZT8-11 0.04970825 0.04970825 0.04970825 ZT12-15 0.04902895 0.04902895 0.04902895 ZT16-19 0.03990655 0.03990655 0.03990655 ZT20-23 0.0196799 0.0196799 0.0196799