condition mean min max ZT0-3 1.4 1.4 1.4 ZT4-7 1.1 1.1 1.1 ZT8-11 13.05 13.05 13.05 ZT12-15 2.5 2.5 2.5 ZT16-19 3.85 3.85 3.85 ZT20-23 3.6500000000000004 3.6500000000000004 3.6500000000000004