6.2.3.6 Birth certificate (Column P7) The purpose of this question is to find out if household members have a birth certificate or a suppletory judgment. This question allows for the introduction of questions related to the date of birth (check the accuracy of the age). If the respondent has a birth certificate or a suppletory judgment, age is easily obtained. If the person has a birth certificate or a suppletory judgment, the agent records the code "1," otherwise, he noted "2." In case the respondent does not know (DK), the agent records the code "3."