condition mean min max ZT0-3 3.05 3.05 3.05 ZT4-7 1.6 1.6 1.6 ZT8-11 2.95 2.95 2.95 ZT12-15 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT16-19 3.6 3.6 3.6 ZT20-23 2.05 2.05 2.05