condition mean min max ZT0-3 1.0 1.0 1.0 ZT4-7 0.9 0.9 0.9 ZT8-11 1.25 1.25 1.25 ZT12-15 0.6000000000000001 0.6000000000000001 0.6000000000000001 ZT16-19 1.25 1.25 1.25 ZT20-23 1.05 1.05 1.05