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Blood level study

Study of 387 rural Indian schoolchildren: lower vitamin D weakly linked to more colds

Mandlik and colleagues · Indian journal of pediatrics · 2019

Original title: Infection Status of Rural Schoolchildren and its Relationship with Vitamin D Concentrations.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Points to benefit

Number of upper respiratory infections was weakly linked to lower vitamin D (rs = -0.14, p < 0.05). Vitamin D sufficient children reported fewer and shorter episodes. No link with total infections.

The study at a glance

Type of study
Blood level study
Who or what was studied
387 people · Rural schoolchildren near Pune, India
What was tested
Vitamin D blood level compared with colds and other infections reported in a questionnaire
What it measured
The question itself: colds, flu and other respiratory infections
Who has a stake
No disclosure in PubMed
No disclosure in PubMed.
Journal
Indian journal of pediatrics, 2019
Source
PubMed record 30915647. This page is based on the abstract only.

How much this study counts

  • –Links blood levels to health. A blood level can be a sign of illness rather than a cause.
  • •387 people.
  • ✓Measured the question itself: colds, flu and other respiratory infections.
  • •The PubMed record has no conflict-of-interest statement.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: colds, flu and chest infections

    10

    2 benefit, 8 no difference

  2. Trials in people: other measures

    5

    1 benefit, 1 mixed, 2 no difference, 1 harm

  3. Trials in people: lab tests or safety

    1

    1 no difference

  4. Population studies

    1

    1 no difference

  5. Blood levels and genes

    4

    3 benefit, 1 no difference

    ↑ This study is the ringed dot

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “Does vitamin D prevent colds and infections?”

Not clearly; any effect looks small.

Confidence: low. Based on 33 on-topic papers.

Read the full answer

Of the other 3 papers on the same step: 2 benefit, 1 no difference. This one found benefit. It agrees with most of them.

  • Counted on the ladder, but not quoted in the page’s main findings.

Other papers on the same step

See all 33 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads differed. The reviewer checked the abstract and kept the first read. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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