condition mean min max ZT0-3 2.2 2.2 2.2 ZT4-7 2.0 2.0 2.0 ZT8-11 11.05 11.05 11.05 ZT12-15 2.05 2.05 2.05 ZT16-19 1.75 1.75 1.75 ZT20-23 2.5 2.5 2.5