The target population included female adolescents, aged
12–19 yr, who were continuously enrolled (monthly enrollment)
for 18 months (1/1/98–6/30/99) in the Ohio
Medicaid fee-for-service program. Administrative claims
data were available through an ongoing drug utilization
review and health services research grant between
the Ohio Department of Human Services and the University
of Cincinnati. Pharmacy, medical, and institutional
claims were used