condition mean min max ZT0-3 1.5 1.5 1.5 ZT4-7 0.7 0.7 0.7 ZT8-11 12.65 12.65 12.65 ZT12-15 0.7 0.7 0.7 ZT16-19 1.95 1.95 1.95 ZT20-23 6.449999999999999 6.449999999999999 6.449999999999999