condition mean min max ZT0-3 22.901449999999997 19.6378 26.1651 ZT4-7 10.775649999999999 10.775649999999999 10.775649999999999 ZT8-11 7.852035 7.852035 7.852035 ZT12-15 0 0 0 ZT16-19 11.068850000000001 11.068850000000001 11.068850000000001 ZT20-23 16.1237 16.1237 16.1237