condition mean min max ZT0-3 3.2986416666666667 0.0 9.895925 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 1.75652 0.0 3.51304 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0