condition mean min max ZT0-3 9.327748 9.327748 9.327748 ZT4-7 10.167596 10.167596 10.167596 ZT8-11 8.847335000000001 8.847335000000001 8.847335000000001 ZT12-15 11.811659 11.811659 11.811659 ZT16-19 12.5915885 12.5915885 12.5915885 ZT20-23 10.9074475 10.9074475 10.9074475