condition mean min max ZT0-3 0.0538665 0.0 0.107733 ZT4-7 0.561835 0.561835 0.561835 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.325783 0.325783 0.325783 ZT20-23 0.2172245 0.2172245 0.2172245