condition mean min max ZT0-3 0.01961833333333333 0.0 0.058855 ZT4-7 0.03572685 0.03572685 0.03572685 ZT8-11 0.0 0.0 0.0 ZT12-15 0.01019915 0.0 0.0203983 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0197669 0.0197669 0.0197669