condition mean min max ZT0-3 386.996643 386.996643 386.996643 ZT4-7 537.664252 537.664252 537.664252 ZT8-11 503.149945 503.149945 503.149945 ZT12-15 490.2940125 490.2940125 490.2940125 ZT16-19 423.0182535 423.0182535 423.0182535 ZT20-23 392.52819 392.52819 392.52819