condition mean min max ZT0-3 2.2 2.2 2.2 ZT4-7 1.4 1.4 1.4 ZT8-11 4.7 4.7 4.7 ZT12-15 11.65 11.65 11.65 ZT16-19 2.0 2.0 2.0 ZT20-23 4.25 4.25 4.25