condition mean min max ZT0-3 25.594725 21.583550000000002 29.6059 ZT4-7 15.47475 15.47475 15.47475 ZT8-11 8.80655 8.80655 8.80655 ZT12-15 0 0 0 ZT16-19 28.7302 28.7302 28.7302 ZT20-23 28.303449999999998 28.303449999999998 28.303449999999998