condition mean min max ZT0-3 28.75 28.75 28.75 ZT4-7 15.9 15.9 15.9 ZT8-11 15.799999999999999 15.799999999999999 15.799999999999999 ZT12-15 44.05 44.05 44.05 ZT16-19 17.0 17.0 17.0 ZT20-23 13.75 13.75 13.75