condition mean min max ZT0-3 0.6499999999999999 0.6499999999999999 0.6499999999999999 ZT4-7 0.7 0.7 0.7 ZT8-11 2.05 2.05 2.05 ZT12-15 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT16-19 1.25 1.25 1.25 ZT20-23 1.9 1.9 1.9