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home:pathogenesis:vitamind:observational_bias [10.27.2018] – [People who supplement with vitamin D are demonstrably different] sallieq | home:pathogenesis:vitamind:observational_bias [09.14.2022] (current) – external edit 127.0.0.1 | ||
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- | Controlled trials showed that HRT caused a small and significant increase in risk of CHD. Re-analysis of the data showed that women undertaking HRT were more likely to be from [[http:// | + | Controlled trials showed that HRT caused a small and significant increase in risk of CHD. Re-analysis of the data showed that women undertaking HRT were more likely to be from [[https:// |
- | According to [[http:// | + | According to [[https:// |
- | One retrospective commentary, full of all the requisite browbeating, | + | One retrospective commentary, full of all the requisite browbeating, |
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Studies in which a cohort is self-selecting can be fraught with error, especially when the groups are substantively different. The people who take vitamin D are different than those who don't. They tend to have more money, better education, and better health care, a well-documented pattern. | Studies in which a cohort is self-selecting can be fraught with error, especially when the groups are substantively different. The people who take vitamin D are different than those who don't. They tend to have more money, better education, and better health care, a well-documented pattern. | ||
- | One recent British study is typical.(({{pubmed> | + | One recent British study is typical.(({{pmid> |
According to the results, subjects in the highest socioeconomic class were almost twice as likely to take cod liver, fish oil, or other supplements containing vitamin D as those in a lower class (p < 0.0001). | According to the results, subjects in the highest socioeconomic class were almost twice as likely to take cod liver, fish oil, or other supplements containing vitamin D as those in a lower class (p < 0.0001). | ||
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|**Unclassified** |12.2% | | |**Unclassified** |12.2% | | ||
- | Even studies looking at rates of supplementation in countries where the practice is more widespread have noted this effect. In a study of the 1966 Northern Finland birth cohort, which consisted of 7,648 people, it's apparent that socioeconomic status correlates with the choice to give supplements containing vitamin D.(({{pubmed> | + | Even studies looking at rates of supplementation in countries where the practice is more widespread have noted this effect. In a study of the 1966 Northern Finland birth cohort, which consisted of 7,648 people, it's apparent that socioeconomic status correlates with the choice to give supplements containing vitamin D.(({{pmid> |
* 86% of mothers who follow health education gave their children vitamin D supplements as opposed to 79% who rarely or never did. | * 86% of mothers who follow health education gave their children vitamin D supplements as opposed to 79% who rarely or never did. | ||
* 88% of professional mothers gave their sons and daughters vitamin D supplements as opposed to 74% of farmers' | * 88% of professional mothers gave their sons and daughters vitamin D supplements as opposed to 74% of farmers' | ||
* 87% of those with more than a basic education gave the supplement as opposed to 80% who had a basic or no education. | * 87% of those with more than a basic education gave the supplement as opposed to 80% who had a basic or no education. | ||
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+ | ==== Unreliable research, Press releases ==== | ||
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{{tag> | {{tag> | ||
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===== Notes and comments ===== | ===== Notes and comments ===== | ||
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* | * | ||
- | ===== References ===== | + | ===== References =====</ |