condition mean min max ZT0-3 0.6 0.6 0.6 ZT4-7 1.1 1.1 1.1 ZT8-11 8.35 8.35 8.35 ZT12-15 1.2 1.2 1.2 ZT16-19 1.75 1.75 1.75 ZT20-23 0.85 0.85 0.85