condition mean min max ZT0-3 131.038622 131.038622 131.038622 ZT4-7 56.588169 56.588169 56.588169 ZT8-11 50.952629 50.952629 50.952629 ZT12-15 51.180391 51.180391 51.180391 ZT16-19 37.9341035 37.9341035 37.9341035 ZT20-23 49.0094895 49.0094895 49.0094895