condition mean min max ZT0-3 0.03517875 0.0 0.0703575 ZT4-7 0.052023999999999994 0.052023999999999994 0.052023999999999994 ZT8-11 0.047993 0.047993 0.047993 ZT12-15 0.018392125 0.0 0.03678425 ZT16-19 0.05255116666666667 0.0 0.10510233333333334 ZT20-23 0 0 0