condition mean min max ZT0-3 35.7667 33.52065 38.01275 ZT4-7 30.12635 30.12635 30.12635 ZT8-11 46.348600000000005 46.348600000000005 46.348600000000005 ZT12-15 0 0 0 ZT16-19 54.47895 54.47895 54.47895 ZT20-23 38.7047 38.7047 38.7047