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 0.0 0.0 0.0 ZT16-19 0.023023374333333332 0.0 0.046046748666666665 ZT20-23 0.0739176935 0.0 0.147835387