The PFAS body burden in fetal tissues has been shown to increase with gestational age and is believed to coincide with trans-placental transfer29,128,129. To assess the influence of this hypothesized confounder on the enriched signals and pathways associated with PFAS exposure, we conducted sensitivity analyses without adjusting for the week when the maternal serum sample was collected and compared the results to those obtained in the main analyses. We also performed sensitivity analyses to identify similarities across the enriched pathways associated with PFAS and birth outcomes at the serially reduced significance thresholds, as described above.
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