Definition
HEALTHIDX (V418) reports the number of entries (number of children) in the health or immunization history. This number is typically equal to the number of births in the three (BIRTHSTOT3YR (V238)) or five (BIRTHSIN5YRS (V208) years before the survey. While there is, theoretically, no limit to the number of births recorded in BIRTHSTOT3YR and BIRTHSIN5YRS, HEALTHIDX is actually limited to the number of columns that can be completed on the survey form. In most cases, HEALTHIDX is capped at six.