condition mean min max ZT0-3 1.65 1.65 1.65 ZT4-7 10.7 10.7 10.7 ZT8-11 19.1 19.1 19.1 ZT12-15 6.449999999999999 6.449999999999999 6.449999999999999 ZT16-19 10.95 10.95 10.95 ZT20-23 9.75 9.75 9.75