condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.019235275 0.0 0.03847055 ZT16-19 0.04362216666666666 0.0 0.08724433333333333 ZT20-23 0 0 0