condition mean min max ZT0-3 3.45 3.45 3.45 ZT4-7 0.3 0.3 0.3 ZT8-11 0.75 0.75 0.75 ZT12-15 1.05 1.05 1.05 ZT16-19 0.8500000000000001 0.8500000000000001 0.8500000000000001 ZT20-23 12.3 12.3 12.3