condition mean min max ZT0-3 28.462475 21.5957 35.32925 ZT4-7 21.015900000000002 21.015900000000002 21.015900000000002 ZT8-11 22.1694 22.1694 22.1694 ZT12-15 31.806150000000002 26.290300000000002 37.322 ZT16-19 33.72006666666667 31.1872 36.25293333333333 ZT20-23 0 0 0