condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.02481762083333333 0.0 0.04963524166666666 ZT16-19 0.0 0.0 0.0 ZT20-23 0.017668348 0.0 0.035336696