condition mean min max ZT0-3 33.2 33.2 33.2 ZT4-7 33.9 33.9 33.9 ZT8-11 32.65 32.65 32.65 ZT12-15 17.05 17.05 17.05 ZT16-19 28.75 28.75 28.75 ZT20-23 27.5 27.5 27.5