condition mean min max ZT0-3 0.05832235 0.05832235 0.05832235 ZT4-7 0.02546375 0.02546375 0.02546375 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0251966 0.0251966 0.0251966 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0989387 0.0989387 0.0989387