condition mean min max ZT0-3 19.05 19.05 19.05 ZT4-7 6.1 6.1 6.1 ZT8-11 57.05 57.05 57.05 ZT12-15 17.8 17.8 17.8 ZT16-19 27.75 27.75 27.75 ZT20-23 6.449999999999999 6.449999999999999 6.449999999999999