condition mean min max ZT0-3 0.19642935 0.12722699999999998 0.3188105 ZT4-7 0.0 0.0 0.0 ZT8-11 0.09424375 0.09424375 0.09424375 ZT12-15 0.099260775 0.0684045 0.13011705 ZT16-19 0.08693980000000001 0.08693980000000001 0.08693980000000001 ZT20-23 0.1667054 0.1667054 0.1667054