condition mean min max ZT0-3 15.96765 15.96765 15.96765 ZT4-7 10.867750000000001 10.867750000000001 10.867750000000001 ZT8-11 12.830649999999999 12.830649999999999 12.830649999999999 ZT12-15 11.95665 11.95665 11.95665 ZT16-19 19.443150000000003 19.443150000000003 19.443150000000003 ZT20-23 15.8459 15.8459 15.8459