Methods
Using the Utah Population Database, a populationābased genealogical
resource linked with state fetal death and birth records, we identified
high-risk pedigrees with excess familial aggregation of stillbirth using
the Familial Standardized Incidence Ratio (FSIR). Stillbirth odds ratio
(OR) for first-degree relatives (FDR), second-degree relatives (SDR),
and third-degree relatives (TDR) of parents with a stillbirth and
live-birth were estimated using logistic regression models.