condition mean min max ZT0-3 2.55 2.55 2.55 ZT4-7 1.2 1.2 1.2 ZT8-11 14.95 14.95 14.95 ZT12-15 2.6 2.6 2.6 ZT16-19 12.05 12.05 12.05 ZT20-23 3.5 3.5 3.5