condition mean min max ZT0-3 0.02529515 0.02529515 0.02529515 ZT4-7 0.0207787 0.0207787 0.0207787 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.03660345 0.03660345 0.03660345 ZT20-23 0.0090408 0.0090408 0.0090408