condition mean min max ZT0-3 5.55 5.55 5.55 ZT4-7 4.3 4.3 4.3 ZT8-11 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT12-15 4.9 4.9 4.9 ZT16-19 6.25 6.25 6.25 ZT20-23 2.35 2.35 2.35