condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.068023475 0.0523955 0.08365145 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0