condition mean min max ZT0-3 587.2438 587.2438 587.2438 ZT4-7 783.339587 783.339587 783.339587 ZT8-11 966.6484989999999 966.6484989999999 966.6484989999999 ZT12-15 1094.4554495 1094.4554495 1094.4554495 ZT16-19 863.0868155000001 863.0868155000001 863.0868155000001 ZT20-23 822.8760155 822.8760155 822.8760155