condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0465959 0.0465959 0.0465959 ZT8-11 0.021675899999999998 0.021675899999999998 0.021675899999999998 ZT12-15 0.0353866875 0.0 0.070773375 ZT16-19 0.013686916666666667 0.0 0.027373833333333333 ZT20-23 0 0 0