condition mean min max ZT0-3 1.6 1.6 1.6 ZT4-7 0.6 0.6 0.6 ZT8-11 16.6 16.6 16.6 ZT12-15 5.1 5.1 5.1 ZT16-19 0.7 0.7 0.7 ZT20-23 3.05 3.05 3.05