condition mean min max ZT0-3 10.3 10.3 10.3 ZT4-7 33.5 33.5 33.5 ZT8-11 3.45 3.45 3.45 ZT12-15 32.95 32.95 32.95 ZT16-19 10.6 10.6 10.6 ZT20-23 15.4 15.4 15.4