condition mean min max ZT0-3 0.6487893333333333 0.456064 0.8091965 ZT4-7 0.450438 0.450438 0.450438 ZT8-11 0.31144700000000003 0.31144700000000003 0.31144700000000003 ZT12-15 1.784905 1.72301 1.8468 ZT16-19 1.0175195 1.0175195 1.0175195 ZT20-23 0.663334 0.663334 0.663334