condition mean min max ZT0-3 26.392300000000002 25.0756 27.709000000000003 ZT4-7 18.7638 18.7638 18.7638 ZT8-11 22.83765 22.83765 22.83765 ZT12-15 0 0 0 ZT16-19 33.752250000000004 33.752250000000004 33.752250000000004 ZT20-23 29.9182 29.9182 29.9182