condition mean min max ZT0-3 45.8 45.8 45.8 ZT4-7 60.5 60.5 60.5 ZT8-11 20.75 20.75 20.75 ZT12-15 69.8 69.8 69.8 ZT16-19 67.85 67.85 67.85 ZT20-23 44.0 44.0 44.0