condition mean min max ZT0-3 14.049999999999999 14.049999999999999 14.049999999999999 ZT4-7 37.9 37.9 37.9 ZT8-11 27.9 27.9 27.9 ZT12-15 17.85 17.85 17.85 ZT16-19 13.75 13.75 13.75 ZT20-23 10.5 10.5 10.5