condition mean min max ZT0-3 21.25 21.25 21.25 ZT4-7 32.5 32.5 32.5 ZT8-11 27.95 27.95 27.95 ZT12-15 40.599999999999994 40.599999999999994 40.599999999999994 ZT16-19 12.7 12.7 12.7 ZT20-23 43.3 43.3 43.3