condition mean min max ZT0-3 1.3 1.3 1.3 ZT4-7 1.5 1.5 1.5 ZT8-11 1.0 1.0 1.0 ZT12-15 1.35 1.35 1.35 ZT16-19 12.799999999999999 12.799999999999999 12.799999999999999 ZT20-23 1.1 1.1 1.1