condition mean min max ZT0-3 694.385903 694.385903 694.385903 ZT4-7 767.5013325 767.5013325 767.5013325 ZT8-11 727.5486215 727.5486215 727.5486215 ZT12-15 597.375672 597.375672 597.375672 ZT16-19 514.9512540000001 514.9512540000001 514.9512540000001 ZT20-23 709.9703775 709.9703775 709.9703775