condition mean min max ZT0-3 4.5 4.5 4.5 ZT4-7 4.9 4.9 4.9 ZT8-11 12.7 12.7 12.7 ZT12-15 4.05 4.05 4.05 ZT16-19 22.8 22.8 22.8 ZT20-23 4.8 4.8 4.8