condition mean min max ZT0-3 27.40365 26.485999999999997 28.3213 ZT4-7 5.901735 5.901735 5.901735 ZT8-11 4.25637 4.25637 4.25637 ZT12-15 0 0 0 ZT16-19 4.26827 4.26827 4.26827 ZT20-23 9.23994 9.23994 9.23994