condition mean min max ZT0-3 27.793225 25.021250000000002 30.565199999999997 ZT4-7 24.534599999999998 24.534599999999998 24.534599999999998 ZT8-11 26.09685 26.09685 26.09685 ZT12-15 0 0 0 ZT16-19 33.682950000000005 33.682950000000005 33.682950000000005 ZT20-23 30.96815 30.96815 30.96815