condition mean min max ZT0-3 3.8 3.8 3.8 ZT4-7 4.5 4.5 4.5 ZT8-11 25.05 25.05 25.05 ZT12-15 7.8 7.8 7.8 ZT16-19 2.5 2.5 2.5 ZT20-23 12.65 12.65 12.65