condition mean min max ZT0-3 5.25 5.25 5.25 ZT4-7 5.5 5.5 5.5 ZT8-11 32.95 32.95 32.95 ZT12-15 3.4 3.4 3.4 ZT16-19 2.05 2.05 2.05 ZT20-23 1.8 1.8 1.8