condition mean min max ZT0-3 17.6 17.6 17.6 ZT4-7 1.6 1.6 1.6 ZT8-11 2.9 2.9 2.9 ZT12-15 6.35 6.35 6.35 ZT16-19 1.05 1.05 1.05 ZT20-23 3.95 3.95 3.95