condition mean min max ZT0-3 2.25 2.25 2.25 ZT4-7 5.5 5.5 5.5 ZT8-11 22.4 22.4 22.4 ZT12-15 4.1 4.1 4.1 ZT16-19 4.3 4.3 4.3 ZT20-23 3.6500000000000004 3.6500000000000004 3.6500000000000004