condition mean min max ZT0-3 19.2915 19.2915 19.2915 ZT4-7 9.34687 9.34687 9.34687 ZT8-11 9.863835 9.863835 9.863835 ZT12-15 16.561999999999998 16.561999999999998 16.561999999999998 ZT16-19 28.82025 28.82025 28.82025 ZT20-23 26.46705 26.46705 26.46705