Skip to the main content
Open WellbeingWhat the studies actually measured

Bone strength

Calciumand Bone Mineral Density (Lumbar Spine)

Only one source here so far, and it found no clear difference in bone Mineral Density (Lumbar Spine).

How sure anyone can be

Moderate certainty, level 3 of 4

Further research may change this.

The numbers reported

No number has been put on this yet. One source recorded only which way the numbers went — for now, that is all we have here.

One source, newest first

What we read is the published abstract, not the full paper, so a blank below may still be printed in the paper itself. A fixed rule worked this out from the source’s own fields. Nobody checked this rating by hand.

  • Systematic review, 2022

    Moderate certainty, level 3 of 4

    The effect of calcium supplementation in people under 35 years old: A systematic review and meta-analysis of randomized controlled trials.

    Elife. 2022;11. doi:10.7554/eLife.79002. PMID:36164828.

    Number reported
    Not in the abstract
    Which way it went
    No clear difference
    Likely range
    Not in the abstract
    Source’s own words
    standardised mean difference in lumbar spine BMD vs control (magnitude not reported in abstract)
    Who was studied
    Adult and child under 35
    Compared with
    placebo or usual intake
    Amount taken
    Not applicable as one amount for a pooled estimate — mg/d calcium (pooled analysis spans all doses and both supplement and high-calcium-diet trials)
    For how long
    Not in the abstract
    Disagreement between studies
    Not in the abstract
    Kind of record
    Journal article
    How this rating was reachedstarts at High, one step down: imprecision
    1. Starts at High
    2. Imprecision brought it down to Moderatethe abstract reports no confidence interval for the estimateNot in the abstract
    3. Ends at ModerateOne step down.
    Checked, nothing to step it down for
    risk of bias and indirectness
    Inconsistency
    No disagreement reported, and no count of studies behind it

    Imprecision stops at the first check that applies; others may apply too.

    AI-reviewed & signed — an AI agent re-read this finding against the saved source and checked that the quote, the numbers, the units and the direction match it. No person read it. The owner authorised the agent to sign the batch with the owner's key, and every build rechecks that signature against these exact bytes.

    Read the abstract on PubMed

What is still missing from these readings

  • No number at all, only which way it went.
  • One gives no likely range, so how precise that number is is unknown.
  • One do not say how many people took part.
  • For how long — Not in the abstract.

Something nobody wrote down is never a zero and never a guess.

Still to read for Calcium

Three of the nine things on our list for Calcium have no reading here yet:

  • HDL cholesterol
  • LDL cholesterol
  • Parathyroid Hormone (PTH)

Still to read means nobody here has got to it, not that it was tried and did nothing or that no research exists. A pairing on no list is not a gap: we never set out to read it.

Read next

This is a library, not advice. No recommendation, no dose, no diagnosis, no ranking. We never ask about your symptoms, and nothing here is tailored to you.