condition mean min max ZT0-3 2.25 2.25 2.25 ZT4-7 0.7 0.7 0.7 ZT8-11 7.25 7.25 7.25 ZT12-15 2.75 2.75 2.75 ZT16-19 2.2 2.2 2.2 ZT20-23 3.25 3.25 3.25