condition mean min max ZT0-3 18.634574999999998 17.75805 19.5111 ZT4-7 12.426449999999999 12.426449999999999 12.426449999999999 ZT8-11 9.144905000000001 9.144905000000001 9.144905000000001 ZT12-15 0 0 0 ZT16-19 13.2229 13.2229 13.2229 ZT20-23 15.0519 15.0519 15.0519