condition mean min max ZT0-3 36.849999999999994 36.849999999999994 36.849999999999994 ZT4-7 35.3 35.3 35.3 ZT8-11 46.2 46.2 46.2 ZT12-15 19.95 19.95 19.95 ZT16-19 13.75 13.75 13.75 ZT20-23 6.05 6.05 6.05