The overlap between miscarriage and extreme preterm birth in a limited-resource setting on the Thailand-Myanmar border: a population cohort study
Bibliographic record
Abstract
<ns4:p> <ns4:bold>Background</ns4:bold> <ns4:italic>: </ns4:italic> Countries vary on the demarcation gestational age that distinguishes miscarriage and extreme preterm birth (PTB). This study provides a synopsis of the outcome of pregnancy between 22 to <28 weeks’ gestation from a low resource setting. </ns4:p> <ns4:p> <ns4:bold>Methods</ns4:bold> <ns4:italic>: </ns4:italic> A retrospective record review of a refugee and migrant population on the Thailand-Myanmar border with outcome between 22 to <28 weeks’ gestation, was conducted. Outcomes were classified as miscarriage: non-viability prior to 22 week’s gestation with expulsion of products between 22 to < 28 weeks’ gestation; or extreme PTB when the fetus was viable at ≥22 weeks and delivered between 22 to < 28 weeks’ gestation. Termination of pregnancy and gestational trophoblastic disease were excluded. </ns4:p> <ns4:p> <ns4:bold>Results</ns4:bold> <ns4:italic>: </ns4:italic> From 1995-2015, outcomes occurred between 22 to <28 weeks’ gestation in 0.9% (472/49,931) of pregnancies and 3.8% (18/472) met the exclusion criteria. Most included pregnancies (n=454) had ultrasound done 72.5% (n=329). Overall 43.6% (n=197) were miscarriage and 56.4% (n=257) extreme PTB. Miscarriage (late expulsion) between 22 to <28 weeks was observed with non-viability occurring at an estimated median gestation of 16 weeks. For cases with available data (n=252, 5 missing) the proportion of stillborn was 47.6% (n=120), liveborn 52.4% (n=132); and congenital abnormality 10.5% (24/228, 29 missing). Neonatal death was high 98.5% (128/131, 1 missing). Introduction of ultrasound was associated with a 2-times higher odds of classification of outcome as birth rather than miscarriage. </ns4:p> <ns4:p> <ns4:bold>Conclusion</ns4:bold> <ns4:italic>: </ns4:italic> In this low resource setting <1% of pregnancy outcomes occur in the 22 to <28 weeks’ gestation window; nearly half were miscarriage; and neonatal mortality approached 100%. In the scale-up to preventable newborns deaths, at least initially, greater benefits will be obtained by focusing on the greater number of viable newborns with a gestation of 28 weeks or more. </ns4:p>
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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 | 0.011 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.000 | 0.002 |
| 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".