condition mean min max ZT0-3 1.5519107499999998 0.7838765000000001 2.3199449999999997 ZT4-7 1.024853 1.024853 1.024853 ZT8-11 0.4717865 0.4717865 0.4717865 ZT12-15 0 0 0 ZT16-19 1.774305 1.774305 1.774305 ZT20-23 1.240425 1.240425 1.240425