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 0.0 0.0 0.0 ZT16-19 0.027050035833333333 0.014375383666666665 0.039724688 ZT20-23 0.007045195999999999 0.0 0.014090391999999998