condition mean min max ZT0-3 67.65 67.65 67.65 ZT4-7 5.5 5.5 5.5 ZT8-11 56.75 56.75 56.75 ZT12-15 69.15 69.15 69.15 ZT16-19 81.25 81.25 81.25 ZT20-23 56.349999999999994 56.349999999999994 56.349999999999994