condition mean min max ZT0-3 70.0 70.0 70.0 ZT4-7 87.4 87.4 87.4 ZT8-11 35.8 35.8 35.8 ZT12-15 44.95 44.95 44.95 ZT16-19 67.0 67.0 67.0 ZT20-23 70.05 70.05 70.05