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                                       VITAL STATISTICS FORMULAS




   (crude) live birth rate =                     1,000       X              number of live births
                                                                                 population


   (crude) death rate =                          1,000       X                number of deaths
                                                                                 population


   (crude) marriage rate =                       1,000       X               number of marriages
                                                                                 population


   (crude) divorce rate =                        1,000       X          number of divorces & annulments
                                                                                 population


   cause-specific mortality rate =             100,000       X          number of deaths from the cause
                                                                                 population


   maternal mortality rate =                   100,000       X             number of deaths attributed
                                                                             to maternal conditions  
                                                                             number of live births


   neonatal mortality rate =                     1,000       X         number of deaths under age 28 days
                                                                             number of live births


   postneonatal mortality rate =                 1,000       X          number of deaths age 28 days or
                                                                          more and less than one year  
                                                                              number of live births


   infant mortality rate =                       1,000       X               number of deaths under
                                                                                age of one year   
                                                                              number of live births


   fetal mortality rate =                        1,000       X        number of fetal deaths (stillbirths)
                                                                      number of fetal deaths (stillbirths)
                                                                                plus live births


   induced abortion ratio =                        100       X            number of induced abortions
                                                                             number of live births


   percentage live births to unmarried women =     100       X           number of children born alive
                                                                               to unmarried women     
                                                                             number of live births


   percentage low birth weight =                   100       X          number of children born alive of
                                                                          weight less than 2,500 grams
                                                                                  (5 1/2 pounds)        
                                                                            number of live births of
                                                                                   all weights


   Note:  Crude marriage and divorce rates are tabulated using occurrence data rather than residence data.
          Race-specific rates/percents/ratios use the same formula as above, except that both numerator
          and denominator are for the stated race.

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