condition mean min max ZT0-3 5.35 5.35 5.35 ZT4-7 2.2 2.2 2.2 ZT8-11 9.0 9.0 9.0 ZT12-15 3.25 3.25 3.25 ZT16-19 2.85 2.85 2.85 ZT20-23 5.2 5.2 5.2