condition mean min max ZT0-3 2.3 2.3 2.3 ZT4-7 12.7 12.7 12.7 ZT8-11 1.05 1.05 1.05 ZT12-15 10.85 10.85 10.85 ZT16-19 33.85 33.85 33.85 ZT20-23 14.0 14.0 14.0