condition mean min max ZT0-3 0.02790975 0.02790975 0.02790975 ZT4-7 0.0979871 0.0979871 0.0979871 ZT8-11 0.03974575 0.03974575 0.03974575 ZT12-15 0.0161807 0.0161807 0.0161807 ZT16-19 0.04242815 0.04242815 0.04242815 ZT20-23 0.03543655 0.03543655 0.03543655