condition mean min max ZT0-3 1274.782724 1274.782724 1274.782724 ZT4-7 626.629906 626.629906 626.629906 ZT8-11 123.1654605 123.1654605 123.1654605 ZT12-15 213.55989 213.55989 213.55989 ZT16-19 50.7253475 50.7253475 50.7253475 ZT20-23 54.169000999999994 54.169000999999994 54.169000999999994