condition mean min max ZT0-3 2.05 2.05 2.05 ZT4-7 1.2 1.2 1.2 ZT8-11 16.049999999999997 16.049999999999997 16.049999999999997 ZT12-15 8.5 8.5 8.5 ZT16-19 2.8 2.8 2.8 ZT20-23 3.45 3.45 3.45