condition mean min max ZT0-3 9.25 9.25 9.25 ZT4-7 5.9 5.9 5.9 ZT8-11 15.3 15.3 15.3 ZT12-15 6.25 6.25 6.25 ZT16-19 35.5 35.5 35.5 ZT20-23 3.95 3.95 3.95