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Calculate age at a certain date with month and year variable (option 1)

m.j.c.moester@lumc.nl
30 Sep, 2020

This calculation uses separate year and month of birth variables to calculate the age of a subject at a date (in this example date of complication). The result is the age in years with 2 digits. Please take into account that this is not a precise age due to the missing day of birth. To only get the result in years, replace the ‘M’ with ‘y’ and remove /12.

Fields used in calculation
birthyear
year of birth (numeric)
birthmonth
month of birth (numeric)
date_compl
date at which the age should be calculated
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