condition mean min max ZT0-3 28.95 28.95 28.95 ZT4-7 36.3 36.3 36.3 ZT8-11 33.2 33.2 33.2 ZT12-15 26.3 26.3 26.3 ZT16-19 23.9 23.9 23.9 ZT20-23 44.35 44.35 44.35