condition mean min max ZT0-3 3.95 3.95 3.95 ZT4-7 1.4 1.4 1.4 ZT8-11 3.5 3.5 3.5 ZT12-15 13.75 13.75 13.75 ZT16-19 10.65 10.65 10.65 ZT20-23 4.95 4.95 4.95