condition mean min max ZT0-3 2.2 2.2 2.2 ZT4-7 2.9 2.9 2.9 ZT8-11 10.45 10.45 10.45 ZT12-15 5.0 5.0 5.0 ZT16-19 3.3 3.3 3.3 ZT20-23 2.8 2.8 2.8