condition mean min max ZT0-3 57.75 57.75 57.75 ZT4-7 45.6 45.6 45.6 ZT8-11 33.3 33.3 33.3 ZT12-15 3.6 3.6 3.6 ZT16-19 36.65 36.65 36.65 ZT20-23 30.95 30.95 30.95