condition mean min max ZT0-3 56.849999999999994 56.849999999999994 56.849999999999994 ZT4-7 74.5 74.5 74.5 ZT8-11 82.2 82.2 82.2 ZT12-15 83.05000000000001 83.05000000000001 83.05000000000001 ZT16-19 80.8 80.8 80.8 ZT20-23 28.05 28.05 28.05