condition mean min max ZT0-3 2.65 2.65 2.65 ZT4-7 1.0 1.0 1.0 ZT8-11 5.3 5.3 5.3 ZT12-15 2.6 2.6 2.6 ZT16-19 5.75 5.75 5.75 ZT20-23 1.85 1.85 1.85