{"id":5845,"date":"2011-12-02T17:07:41","date_gmt":"2011-12-02T15:07:41","guid":{"rendered":"http:\/\/www.wjst.de\/blog\/?p=5845"},"modified":"2011-12-03T15:19:53","modified_gmt":"2011-12-03T13:19:53","slug":"deadly-vitamin-d","status":"publish","type":"post","link":"https:\/\/www.wjst.de\/blog\/sciencesurf\/2011\/12\/deadly-vitamin-d\/","title":{"rendered":"Deadly vitamin D"},"content":{"rendered":"

A German newspaper ( \u00c4rztezeitung<\/a> ) reports that vitamin D deficiency apparently increases all-time death rate.<\/p>\n

\nEin Mangel an Vitamin D erh\u00f6ht offenbar die Sterberate.
\nEine Studie in den USA hat ergeben, dass 70 Prozent der knapp 11.000 untersuchten Erwachsenen einen Vitamin-D-Mangel hatten.
\nDas Sterberisiko war in dieser Gruppe dreimal so hoch wie bei Personen ohne einen Mangel an dem Sonnenvitamin.\n<\/p><\/blockquote>\n

Looking at the original paper it appears that this<\/p>\n

\nthis was a retrospective, observational study with a selected population, introducing possible selection bias. The study population was derived from patients who had had their vitamin D levels measured at a hospital laboratory and who were patients in a cardiovascular practice and included in its electronic medical records. Extrapolation to other populations might not be appropriate. Also, isolated vitamin D measurement might not reflect long-term levels. We made an arbitrary decision to use the lowest vitamin D measurement for analysis because this value was thought to most likely represent the subjects\u2019 baseline nonsupplemented level. We were unable to accurately associate the timing of vitamin D measurement and supplement initiation. The dose and duration of vitamin D supplementation were not analyzed, and patient compliance was not measured. Inclusion of vitamin D in multivitamin supplements was not considered.\n<\/p><\/blockquote>\n

If we further look at the original data
\n\"\"<\/a><\/p>\n

we see a rather poorly constructed plot of a survival analysis where clients of a cardiovascular practice are split by tertiles of vitamin D serum levels. The two lower tertiles have been combined for whatever reasons.<\/p>\n

The most wealthy ( best treatment, supplement users? ) and most healthy group ( sunshine exposure, attending for routine checks only? ) shows an about twofold reduced mortality.<\/p>\n

There is nothing to worry about this group. What really worries me, is the poor science and the poor journalism behind the news, that “vitamin D deficiency apparently increases all-time death rate”.<\/p>\n\n

 <\/p>\n

\n CC-BY-NC Science Surf , accessed 13.04.2026<\/span>\n <\/div>","protected":false},"excerpt":{"rendered":"

A German newspaper ( \u00c4rztezeitung ) reports that vitamin D deficiency apparently increases all-time death rate. Ein Mangel an Vitamin D erh\u00f6ht offenbar die Sterberate. Eine Studie in den USA hat ergeben, dass 70 Prozent der knapp 11.000 untersuchten Erwachsenen einen Vitamin-D-Mangel hatten. Das Sterberisiko war in dieser Gruppe dreimal so hoch wie bei Personen … Continue reading Deadly vitamin D<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[2737],"class_list":["post-5845","post","type-post","status-publish","format-standard","hentry","category-sunshine-vitamin","tag-science-without-sense"],"_links":{"self":[{"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/posts\/5845","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/comments?post=5845"}],"version-history":[{"count":10,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/posts\/5845\/revisions"}],"predecessor-version":[{"id":5856,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/posts\/5845\/revisions\/5856"}],"wp:attachment":[{"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/media?parent=5845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/categories?post=5845"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wjst.de\/blog\/wp-json\/wp\/v2\/tags?post=5845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}