condition mean min max ZT0-3 32.5 32.5 32.5 ZT4-7 21.0 21.0 21.0 ZT8-11 37.599999999999994 37.599999999999994 37.599999999999994 ZT12-15 26.75 26.75 26.75 ZT16-19 49.75 49.75 49.75 ZT20-23 46.35 46.35 46.35