condition mean min max ZT0-3 6.05 6.05 6.05 ZT4-7 0.4 0.4 0.4 ZT8-11 9.5 9.5 9.5 ZT12-15 1.05 1.05 1.05 ZT16-19 1.8 1.8 1.8 ZT20-23 9.45 9.45 9.45