condition mean min max ZT0-3 16.3 16.3 16.3 ZT4-7 1.6 1.6 1.6 ZT8-11 16.95 16.95 16.95 ZT12-15 2.35 2.35 2.35 ZT16-19 2.85 2.85 2.85 ZT20-23 2.85 2.85 2.85