condition mean min max ZT0-3 557.614828 557.614828 557.614828 ZT4-7 601.6941265 601.6941265 601.6941265 ZT8-11 552.259331 552.259331 552.259331 ZT12-15 595.6909445 595.6909445 595.6909445 ZT16-19 555.2712584999999 555.2712584999999 555.2712584999999 ZT20-23 595.9453635 595.9453635 595.9453635