condition mean min max ZT0-3 3.3 3.3 3.3 ZT4-7 25.1 25.1 25.1 ZT8-11 2.2 2.2 2.2 ZT12-15 1.6 1.6 1.6 ZT16-19 4.25 4.25 4.25 ZT20-23 4.25 4.25 4.25