Persistent pollutants
Canadian pregnancy cohort maps POP levels in blood
Open access · cc by · source: Europe PMC
MIREC found many POPs in maternal plasma but few in cord blood; parity, age, fish, and birthplace predicted levels.
Study at a glance
- Design
- Cohort — MIREC pregnancy cohort measuring POPs/PFAS in maternal and cord plasma
- N
- N=1983 · 1,983 pregnant women in 10 Canadian cities (2008–2011)
- Population
- Canadian pregnant women and newborns in MIREC
- Outcome
- Maternal and cord POP/PFAS concentrations and demographic correlates
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Among 1983 pregnant women, PFOS had the highest maternal PFAS geometric mean (4.56 μg/L). Maternal PFOA was four times higher than cord PFOA (1.65 vs 0.35 μg/L). Median detections were 14 POPs in maternal plasma versus 2 in cord plasma. Parity lowered most residues; fish eaters and foreign-born mothers had higher OCs/PCBs; 2011 samples were lower than 2008.
Methodology
The MIREC pregnancy cohort measured PCBs, organochlorine pesticides, PBDEs, and PFASs in first-trimester maternal plasma and cord plasma from women recruited in 10 Canadian cities (2008–2011), then related concentrations to demographic and diet covariates.
Limitations
MIREC is a convenience sample of relatively educated, Canadian-born women, so it is not a random national snapshot. Cord:maternal ratios are only for pairs both above the LOD. The paper reports concentrations and predictors, not clinical health outcomes.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
This library holds 10 empirical papers on persistent pollutants with measured outcomes rather than reviews.
Evidence for the claim as stated.
MIREC found many POPs in maternal plasma but few in cord blood; parity, age, fish, and birthplace predicted levels.
Evidence for the claim as stated.
MIREC measured POPs in first-trimester and cord plasma from 1,983 pregnant women in ten Canadian cities (2008–2011). PFOS had the highest maternal PFAS geometric mean (4.56 μg/L); maternal PFOA was four times cord PFOA (1.65 vs 0.35 μg/L); median detections were 14 POPs in maternal plasma versus 2 in cord plasma. The paper reports concentrations and predictors, not clinical health effects.
Evidence for the claim as stated.
Papers sharing the cohort label are not one design. Veneto is an ecological SMR for municipalities; CCHS and PROTECT assign person- or pregnancy-level exposures and model individual outcomes; MIREC maps residues without a disease endpoint; the GraMo phthalate–adipose analysis is a cross-sectional surgery sample that cannot establish temporality (WQS β = −30.089 for GSH). 'Cohort evidence that pollution kills' collapses those differences.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
Papers sharing the cohort label are not one design. Veneto is an ecological SMR for municipalities; CCHS and PROTECT assign person- or pregnancy-level exposures and model individual outcomes; MIREC maps residues without a disease endpoint; the GraMo phthalate–adipose analysis is a cross-sectional surgery sample that cannot establish temporality (WQS β = −30.089 for GSH). 'Cohort evidence that pollution kills' collapses those differences.
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