condition mean min max ZT0-3 1.35 1.35 1.35 ZT4-7 2.2 2.2 2.2 ZT8-11 16.8 16.8 16.8 ZT12-15 29.0 29.0 29.0 ZT16-19 9.0 9.0 9.0 ZT20-23 3.45 3.45 3.45