condition mean min max ZT0-3 1.3 1.3 1.3 ZT4-7 2.2 2.2 2.2 ZT8-11 4.45 4.45 4.45 ZT12-15 7.25 7.25 7.25 ZT16-19 2.35 2.35 2.35 ZT20-23 3.25 3.25 3.25