condition mean min max ZT0-3 3.45 3.45 3.45 ZT4-7 2.6 2.6 2.6 ZT8-11 4.25 4.25 4.25 ZT12-15 1.45 1.45 1.45 ZT16-19 17.9 17.9 17.9 ZT20-23 4.6 4.6 4.6