condition mean min max ZT0-3 0.23226833333333333 0.0 0.696805 ZT4-7 0.630625 0.630625 0.630625 ZT8-11 0.638535 0.638535 0.638535 ZT12-15 0.319485 0.0 0.63897 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0