The present analyses are limited to the AFDC and the CAN and AFDC groups (n = 3,337).
Finally, a small number of subjects had records of pregnancy before the age of 10 years. Although technically possible,
this is both outside the range of statistical reports for teen births and less likely to be associated with contact outside the family;
so, these subjects and any subject who died before the age of 10 years were also dropped from analyses (n = 56)
for a final sample size of 3,281.