condition mean min max ZT0-3 42.5 42.5 42.5 ZT4-7 26.5 26.5 26.5 ZT8-11 47.599999999999994 47.599999999999994 47.599999999999994 ZT12-15 32.95 32.95 32.95 ZT16-19 15.5 15.5 15.5 ZT20-23 27.7 27.7 27.7