Case-Control Investigation
A case-control investigation was conducted
to determine risk factors associated
with EBLLs among children
tested from May 4 to June 12, 2009.
Cases were defined as all children with
venous BLL $10 mg/dL; all children
with undetectable BLLs (capillary BLL
,3.3 mg/dL) were defined as controls.
Case children and controls identified
by IOM through June 12 were interviewed,
based on the IOM screening
schedule (additional case children and
controls were identified too late to be
interviewed).