Newborn screening for congenital hypothyroidism: worldwide coverage 50 years after its start
Bibliographic record
Abstract
Background: Congenital hypothyroidism (CH) is a preventable cause of neurodevelopmental delay in children, detectable by newborn screening (NBS) programs for CH. Since NBS for CH was started in Canada in 1974, numerous countries have successfully implemented this public health strategy. However, in 2014, only 29.3% of newborns worldwide were screened by NBS for CH. Objective: This study aimed to assess the implementation of new NBS programs for CH over the past decade, and screening methods and coverage rates of current programs. In addition, it sought to update the worldwide iodine status. Methods: We reviewed literature data on NBS programs for CH and their coverage rates for each country, using PubMed, Embase and Google searches. Results: Currently, 29.6% of children worldwide are screened for CH. Europe, North America, Oceania, China, Japan and Israel have efficient programs with optimal coverage. Recently, some countries of Central and Western Asia have implemented NBS programs for CH, and coverage has increased in several Asian countries. South America has also seen substantial improvements in coverage. In contrast, almost none of the African countries has widespread screening programs, but some attempts with pilot studies and local initiatives have been witnessed. Global iodine sufficiency has improved, with 149 of 193 countries achieving adequate iodine levels by 2023. Conclusions: Over the past decades, several countries have launched NBS programs for CH or conducted pilot studies, and the coverage of most existing NBS programs has increased. Nevertheless, approximately 70% of newborns worldwide still lack access to NBS for CH, predominantly in African and Asian countries, accounting for a significant part of annual births.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".