+A helpful variable when using the `mcs[1-7]_parent_cm_interview.dta` file is `[A-G]ELIG00`. This records the type of interview the parent completed - either "main interview" or "partner interview". The main interview is longer than the partner interview. Accordingly, some variables in `mcs[1-7]_parent_cm_interview.dta` may only be reported by one parent. For instance, in Wave 1, birth weight was recorded from main interviews only. Different people may answer the main or partner interviews over time - a parent may answer the main interview in one sweep and the partner interview in another, or a caregiver may leave the household and be replaced by another person. Therefore, while `[A-G]ELIG00` can be used to merge data across sweep (e.g., merge main parent interviews together), it is not a persistent identifier for a specific individual. `[A-G]PNUM00` can be retained in this case so that individual respondents can still be identified post-merge. (Note, `mcs[1-7]_parent_cm_interview.dta` appears in all `mcs[1-7]_parent_*.dta` files).
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