condition mean min max ZT0-3 0.43051927100000004 0.292068157 0.5689703850000001 ZT4-7 1.0792021665 0.523726491 1.6346778419999999 ZT8-11 6.18139140675 3.409962733 8.9528200805 ZT12-15 11.965054523 11.759027302 12.171081743999999 ZT16-19 8.964798441 8.481639651 9.447957231 ZT20-23 11.672150171750001 11.589535255000001 11.754765088500001