condition mean min max ZT0-3 45.298547 45.298547 45.298547 ZT4-7 33.928347 33.928347 33.928347 ZT8-11 34.1507815 34.1507815 34.1507815 ZT12-15 41.613245500000005 41.613245500000005 41.613245500000005 ZT16-19 26.6791065 26.6791065 26.6791065 ZT20-23 38.385836999999995 38.385836999999995 38.385836999999995