condition mean min max ZT0-3 5.95 5.95 5.95 ZT4-7 3.8 3.8 3.8 ZT8-11 3.7 3.7 3.7 ZT12-15 18.45 18.45 18.45 ZT16-19 38.95 38.95 38.95 ZT20-23 7.05 7.05 7.05