condition mean min max ZT0-3 34.396515 34.396515 34.396515 ZT4-7 49.9310475 49.9310475 49.9310475 ZT8-11 61.9981355 61.9981355 61.9981355 ZT12-15 47.1520625 47.1520625 47.1520625 ZT16-19 48.106893 48.106893 48.106893 ZT20-23 44.704489499999994 44.704489499999994 44.704489499999994