Letters
Vitamin D and risk of cause specific death
Authors’ reply to Grant and Garland and to Bolland and colleagues
BMJ 2014; 348 doi: https://doi.org/10.1136/bmj.g2931 (Published 29 April 2014) Cite this as: BMJ 2014;348:g2931
- Rajiv Chowdhury, cardiovascular epidemiologist1,
- Oscar H Franco, professor2
- On behalf of Setor Kunutsor, Anna Vitezova, Clare Oliver-Williams, Susmita Chowdhury, Jessica C Kiefte-de-Jong, Hassan Khan, Cristina P Baena, Dorairaj Prabhakaran, Moshe B Hoshen, Becca S Feldman, An Pan, Laura Johnson, Francesca Crowe, and Frank B Hu
- 1Department of Public Health and Primary Care, University of Cambridge, Strangeways Research Laboratory, Cambridge CB1 8RN, UK
- 2Department of Epidemiology, Erasmus MC, Rotterdam, Netherlands
- o.franco{at}erasmusmc.nl
We agree with Grant and Garland that, although existing ecological studies support the findings of our meta-analysis of observational studies, further work—especially that involving well powered randomised intervention studies—is needed.1 2 However, the respective pooled risk ratios that we reported by combining the primary and secondary prevention cohorts are based on indirect comparisons (only a subset of studies provided mortality risk data on people with pre-existing disease).
As Bolland and …
Log in
Log in using your username and password
Log in through your institution
Subscribe from £173 *
Subscribe and get access to all BMJ articles, and much more.
* For online subscription
Access this article for 1 day for:
£38 / $45 / €42 (excludes VAT)
You can download a PDF version for your personal record.