condition mean min max ZT0-3 4.5 4.5 4.5 ZT4-7 1.4 1.4 1.4 ZT8-11 2.9 2.9 2.9 ZT12-15 4.25 4.25 4.25 ZT16-19 14.0 14.0 14.0 ZT20-23 5.0 5.0 5.0