condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0235546 0.0235546 0.0235546 ZT8-11 0.0257585 0.0257585 0.0257585 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0618895 0.0618895 0.0618895 ZT20-23 0.0102886 0.0102886 0.0102886