condition mean min max ZT0-3 17.65 17.65 17.65 ZT4-7 27.9 27.9 27.9 ZT8-11 12.75 12.75 12.75 ZT12-15 17.9 17.9 17.9 ZT16-19 26.85 26.85 26.85 ZT20-23 13.85 13.85 13.85