condition mean min max ZT0-3 3.1500000000000004 3.1500000000000004 3.1500000000000004 ZT4-7 0.9 0.9 0.9 ZT8-11 3.5 3.5 3.5 ZT12-15 2.85 2.85 2.85 ZT16-19 15.25 15.25 15.25 ZT20-23 2.4 2.4 2.4