condition mean min max ZT0-3 31.85 31.85 31.85 ZT4-7 12.2 12.2 12.2 ZT8-11 24.25 24.25 24.25 ZT12-15 34.849999999999994 34.849999999999994 34.849999999999994 ZT16-19 14.299999999999999 14.299999999999999 14.299999999999999 ZT20-23 15.3 15.3 15.3