condition mean min max ZT0-3 4.45 4.45 4.45 ZT4-7 1.7 1.7 1.7 ZT8-11 21.8 21.8 21.8 ZT12-15 3.3 3.3 3.3 ZT16-19 1.4 1.4 1.4 ZT20-23 2.85 2.85 2.85