condition mean min max ZT0-3 13.299999999999999 13.299999999999999 13.299999999999999 ZT4-7 35.4 35.4 35.4 ZT8-11 26.75 26.75 26.75 ZT12-15 16.85 16.85 16.85 ZT16-19 29.65 29.65 29.65 ZT20-23 12.95 12.95 12.95