condition mean min max ZT0-3 32.95 32.95 32.95 ZT4-7 5.3 5.3 5.3 ZT8-11 21.9 21.9 21.9 ZT12-15 15.45 15.45 15.45 ZT16-19 2.75 2.75 2.75 ZT20-23 25.95 25.95 25.95