Weyde et al. 2023 — Gestational metals and cerebral palsy risk
This case-control study nested within Norway’s large MoBa cohort investigates whether gestational blood concentrations of total mercury (tHg), lead (Pb), and total arsenic (tAs) are associated with cerebral palsy (CP) risk in offspring. Blood samples were collected from 144 mothers of children later diagnosed with CP and 1,082 matched controls at gestational weeks 17 to 19. The study found no statistically significant associations between any of the three measured metals and CP risk at the concentration levels observed in this Norwegian population.
Key numbers
Sample: 144 CP cases, 1,082 controls; gestational week 17–19 blood samples. Metals analysed by ICP-MS. Median concentrations in the Norwegian population were low relative to WHO guidelines. No significant association between tHg, Pb, or tAs quartiles and CP risk (p > 0.05 for all). This null finding in a low-exposure population provides useful context for dose-response threshold discussions.
Methods (brief)
Nested case-control within MoBa prospective cohort. ICP-MS analysis of gestational blood. Conditional logistic regression adjusting for maternal age, education, smoking, and parity. Limitations include single gestational timepoint and total rather than speciated arsenic measurement.
Implications
Certification: Relevant to prenatal exposure concerns and vulnerable population framing. Null results at Norwegian background exposure levels do not contradict lower threshold concerns; they suggest that population-level risks may emerge at higher exposure levels.
Courses: Useful illustration of epidemiological design (nested case-control) and the challenge of detecting effects at low population exposure levels.
App: Not directly applicable to food concentration data; exposure context for maternal/fetal risk framing.
Microbiome: Not addressed.