condition mean min max ZT0-3 18.85 18.85 18.85 ZT4-7 6.3 6.3 6.3 ZT8-11 3.55 3.55 3.55 ZT12-15 4.45 4.45 4.45 ZT16-19 28.35 28.35 28.35 ZT20-23 2.6500000000000004 2.6500000000000004 2.6500000000000004