Mid-Menstrual Cycle Decline in Creatinine and Urea Clearances
Bibliographic record
Abstract
In 6 pre-menopausal and 6 post-menopausal women we compared urine volume and excretion of creatinine and urea daily from day 2 of the 1st period of menstruation to day 1 of the 2nd, along with clearances of creatinine (CCr) and urea (C-urea). Clearances were based on 7 serum samples which were taken on day 2 of the 1st menstruation and on days 8, 14, 15, 16, 21, and day 1 of the next menstruation, when 4 cycling hormones were also assayed. Mean group ages were 35 and 59 years for pre- and post-menopausal women. CCr cycled only in the pre-menopausal group, with a nadir around the time of ovulation. The mean CCr combining days 14 and 15 was lower than that for the average of the 5 other days by 22% (p < 0.003) in the pre-menopausal but not in the post-menopausal group (p = 0.99). Average CCr values fell from the peak mean of 129 ml/min on day 8 in the follicular phase to the mean nadir of 93 ml/min for days 14 and 15 and recovered to 117 ml/min by day 1 of the 2nd menstruation; the percent fall in CCr ranged from 9 to 39%. A mid-cycle nadir was also present for C-urea (p = 0.03), also found only in the pre-menopausal group. We conclude that, in pre-menopausal women, there is generally a fall in CCr and C-urea from a peak in the follicular phase to a nadir around ovulation.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".