condition mean min max ZT0-3 0.5174085 0.23848899999999998 0.796328 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.05833325 0.0 0.1166665 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0