condition mean min max ZT0-3 0.0155893 0.0155893 0.0155893 ZT4-7 0.02169675 0.02169675 0.02169675 ZT8-11 0.0175787 0.0175787 0.0175787 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0