Birth weight, length, head circumference and Maternal 25 Hydroxyvitamin D (25OHD) concentration in mother‐infant pairs living in Vancouver, British Columbia, Canada
Bibliographic record
Abstract
Results of studies examining associations between maternal 25OHD and birth anthropometric measures have been equivocal. Here we examine the association between maternal 25OHD (20–35 wks) and each of birth weight, birth length, and head circumference in 306 mother‐infant pairs living in Vancouver (49°N). Mean (SD) maternal 25OHD was 66 (23) nmol/L. 25% and 65% had 25OHD levels <50 and <75 nmol/L, respectively, two commonly‐used cutoffs for vitamin D insufficiency. In multivariate analyses controlling for potential confounders (i.e. maternal height, season, and ethnicity) there was no association [β (95 % CI); P] between maternal 25OHD and each of birth weight [0.2 kg (−2.5, 3.0); P=0.83], birth length [0.08 cm (−0.007, 0.023); P=0.98], or head circumference [0.00 cm (−0.009, 0.008); P=0.98]. Likewise, having a maternal 25OHD < 50 or <75 nmol/L was not associated with birth weight, birth length, or head circumference in logistic regressions. Despite a high prevalence of vitamin D insufficiency, maternal 25OHD was not associated with birth anthropometric measures in this sample. (Supported by the Canadian Vitamin Class Action settlement)
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".