condition mean min max ZT0-3 9.25 9.25 9.25 ZT4-7 1.7 1.7 1.7 ZT8-11 12.35 12.35 12.35 ZT12-15 5.6 5.6 5.6 ZT16-19 3.55 3.55 3.55 ZT20-23 15.1 15.1 15.1