condition mean min max ZT0-3 31.559474 31.559474 31.559474 ZT4-7 32.639264499999996 32.639264499999996 32.639264499999996 ZT8-11 33.816263500000005 33.816263500000005 33.816263500000005 ZT12-15 28.749767 28.749767 28.749767 ZT16-19 50.002595 50.002595 50.002595 ZT20-23 42.113400999999996 42.113400999999996 42.113400999999996