condition mean min max ZT0-3 5.95 5.95 5.95 ZT4-7 2.3 2.3 2.3 ZT8-11 56.05 56.05 56.05 ZT12-15 32.7 32.7 32.7 ZT16-19 18.25 18.25 18.25 ZT20-23 66.9 66.9 66.9