condition mean min max ZT0-3 0.0084481 0.0084481 0.0084481 ZT4-7 0.0 0.0 0.0 ZT8-11 0.01486435 0.01486435 0.01486435 ZT12-15 0.0204716 0.0204716 0.0204716 ZT16-19 0.017481899999999998 0.017481899999999998 0.017481899999999998 ZT20-23 0.009063233333333334 0.009063233333333334 0.009063233333333334