Data sought via the demographic data sheet included each family’s: structure; age of parents/grandparents; educational level of parents; family monthly income; gender of child; age of child; gender of grandparents; reason for grandparents living with adult children; regional area of parents origin; living arrangements (home ownership, renting or living with relatives); presence of a home mortgage; and, length of time and specific area of parents’ industrial employment. Data obtained from the “Pink Book” included each child’s birth weight and developmental growth (current height and weight).