condition mean min max ZT0-3 0.0630966 0.0630966 0.0630966 ZT4-7 0.0 0.0 0.0 ZT8-11 0.02483465 0.02483465 0.02483465 ZT12-15 0.03176095 0.03176095 0.03176095 ZT16-19 0.01228215 0.01228215 0.01228215 ZT20-23 0.04214985 0.04214985 0.04214985