condition mean min max ZT0-3 16.933082916 12.057005142 21.80916069 ZT4-7 4.421149974 3.8666557885 4.9756441595 ZT8-11 5.25127073875 4.5067154335 5.995826043999999 ZT12-15 5.622721567 5.3775721055000005 5.8678710285 ZT16-19 5.27755039675 4.766923948500001 5.788176845 ZT20-23 9.19038486625 9.039147790000001 9.3416219425