condition mean min max ZT0-3 2.6500000000000004 2.6500000000000004 2.6500000000000004 ZT4-7 1.6 1.6 1.6 ZT8-11 3.25 3.25 3.25 ZT12-15 2.5 2.5 2.5 ZT16-19 2.6500000000000004 2.6500000000000004 2.6500000000000004 ZT20-23 3.15 3.15 3.15