condition mean min max ZT0-3 0.09950550000000001 0.050351 0.14866000000000001 ZT4-7 0.1489305 0.1489305 0.1489305 ZT8-11 0.102509 0.102509 0.102509 ZT12-15 0 0 0 ZT16-19 0.0494513 0.0494513 0.0494513 ZT20-23 0.39755300000000005 0.39755300000000005 0.39755300000000005