condition mean min max ZT0-3 0.0099727 0.0099727 0.0099727 ZT4-7 0.04159015 0.04159015 0.04159015 ZT8-11 0.04676225 0.04676225 0.04676225 ZT12-15 0.054265549999999996 0.054265549999999996 0.054265549999999996 ZT16-19 0.0528827 0.0528827 0.0528827 ZT20-23 0.0448752 0.0448752 0.0448752