condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.231287 0.231287 0.231287 ZT8-11 0.70967 0.70967 0.70967 ZT12-15 0 0 0 ZT16-19 0.2303915 0.2303915 0.2303915 ZT20-23 0.0 0.0 0.0