condition mean min max ZT0-3 21.588375 20.23855 22.938200000000002 ZT4-7 14.1062 14.1062 14.1062 ZT8-11 9.81854 9.81854 9.81854 ZT12-15 0 0 0 ZT16-19 25.15095 25.15095 25.15095 ZT20-23 26.5563 26.5563 26.5563