condition mean min max ZT0-3 0.02936685 0.02936685 0.02936685 ZT4-7 0.0 0.0 0.0 ZT8-11 0.015776216666666665 0.015776216666666665 0.015776216666666665 ZT12-15 0.0 0.0 0.0 ZT16-19 0.04980299999999999 0.04980299999999999 0.04980299999999999 ZT20-23 0.06793969999999999 0.06793969999999999 0.06793969999999999