AYesin a column means that you can usually expect the entry to appear. There are many examples of early certificates where the item may be omitted despite provision in the certificate for that item of data. Opt <1896 means optional until 1896 and sometimes this information has been added late...
Another limitation of the live birth certificate data is that it is not possible to surmise from the natality data if a stillbirth occurred: birth certificates are not filled out for stillbirths, and an Apgar score of 0 does not automatically imply that the infant was stillborn. The voluntary...
WHO: recommended definitions, terminol- ogy and format for statistical tables related to the perinatal period and use of a new certificate for cause of perinatal deaths. Modifications rec- ommended by FIGO as amended October 14, 1976. Acta Obstet Gynecol Scand 1977;56:247–53. 15. Blencowe ...