condition mean min max ZT0-3 0.8 0.8 0.8 ZT4-7 1.7 1.7 1.7 ZT8-11 3.25 3.25 3.25 ZT12-15 1.75 1.75 1.75 ZT16-19 10.0 10.0 10.0 ZT20-23 1.0 1.0 1.0