condition mean min max ZT0-3 0.0398655 0.0 0.079731 ZT4-7 0.0786105 0.0786105 0.0786105 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0