condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.972485 0.972485 0.972485 ZT12-15 0.719325 0.0 1.43865 ZT16-19 0.0 0.0 0.0 ZT20-23 1.02529 1.02529 1.02529