condition mean min max ZT0-3 63.85 63.85 63.85 ZT4-7 71.4 71.4 71.4 ZT8-11 50.599999999999994 50.599999999999994 50.599999999999994 ZT12-15 54.95 54.95 54.95 ZT16-19 50.9 50.9 50.9 ZT20-23 84.3 84.3 84.3