condition mean min max ZT0-3 0.2347935 0.0 0.469587 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.231302 0.231302 0.231302 ZT20-23 0.0 0.0 0.0