condition mean min max ZT0-3 61.349999999999994 61.349999999999994 61.349999999999994 ZT4-7 74.8 74.8 74.8 ZT8-11 74.95 74.95 74.95 ZT12-15 73.75 73.75 73.75 ZT16-19 78.15 78.15 78.15 ZT20-23 56.75 56.75 56.75