condition mean min max ZT0-3 10.0 10.0 10.0 ZT4-7 0.8 0.8 0.8 ZT8-11 4.0 4.0 4.0 ZT12-15 4.0 4.0 4.0 ZT16-19 3.9 3.9 3.9 ZT20-23 34.55 34.55 34.55