condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0111685105 0.0 0.022337021 ZT8-11 0.0 0.0 0.0 ZT12-15 0.009932855833333334 0.0 0.019865711666666667 ZT16-19 0.0 0.0 0.0 ZT20-23 0.010701218 0.0 0.021402436