condition mean min max ZT0-3 3.4296885 2.007452 4.8519250000000005 ZT4-7 4.627165 4.627165 4.627165 ZT8-11 2.81474 2.81474 2.81474 ZT12-15 0 0 0 ZT16-19 0.690004 0.690004 0.690004 ZT20-23 0.7510195 0.7510195 0.7510195