Gender Difference in the Effects of Organochlorines and Mercury Exposure on Thyroid Hormones Levels
Bibliographic record
Abstract
ISEE-618 Objective: Organochlorines pollutants (OCs) and mercury (Hg) are widespread environmental pollutants, characterized by their accumulation in the food web chain. PCBs are known endocrine disruptors particularly with respect to thyroid function and/or action. Little data are available on thyrotoxic effects of OCs in adult men and women although recent studies have reported a striking excess of hypothyroidism and a higher prevalence of thyroid disorders in women in relation to OCs exposure. The objectives of the study are to examine THs levels in relation to blood concentrations of OCs and Hg for men and women. Materials and Methods: This cross-sectional study was carried out in 2 fishing communities in Quebec, Canada. An interviewer-administered questionnaire was used to assess species specific fish consumption and a self-administered questionnaire was used to collect sociodemographics, work and medical history. The group (N=213) consisted of 125 (59%) men and 88 (41%) women) with an average age of 49.2 ± 13.1 years old. Results: Overall, OCs concentrations were low and thyroid hormone secretion was within the normal range. For women, TT3 was negatively related to PCB-138, PCB-153, noncoplanar congeners, Arochlor 1260, dioxine-like congeners σ PCBs and DDE levels, but no relation was observed between TT4, TSH, and OCs. On the contrary, for men TT4 decreased in relation to dioxine-like congeners and σ PCBs concentrations and TSH increased significantly in relation to PCB-180, Arochlor 1260, σ PCBs, noncoplanar and dioxine-like congeners levels. However no relation was noted between TT4, TSH, and POCs. The only significant decrease of TT3 levels was in relation to σ POCs. In regard to Hg body burden, for men, a positive relationship was observed between blood total Hg and THs. Conclusions: These findings suggest that at even low levels of exposure, these persistent environmental contaminants can interfere with thyroid status and that there may be important gender differences.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".