condition mean min max ZT0-3 4.35 4.35 4.35 ZT4-7 2.5 2.5 2.5 ZT8-11 2.8 2.8 2.8 ZT12-15 9.5 9.5 9.5 ZT16-19 3.95 3.95 3.95 ZT20-23 17.05 17.05 17.05