From: Vitamin D and subsequent all-age and premature mortality: a systematic review
Study | Year | Country | Design | Population | Sample size | Average age (years)a | Response rate% | Overall representativeness of populationb | Average follow-up duration (years)a |
---|---|---|---|---|---|---|---|---|---|
Bates [28] | 2011 | UK | Prospective cohort | Men and women aged ≥65y | 1,054 | Males 75.8 Females 77.3 | 36 | Fair | 13.5 |
Ford [29] | 2011 | USA | Prospective cohort | Men and women aged over 20 across USA | 7,531 | Mean 45–46 (by ascending 25OHD concentration) | 80 (2001/2 sample), 76 (2003/4 sample) | Excellent | Median 3.8 |
Ginde [30] | 2009 | USA | Prospective cohort | Men and women aged over 65 across USA | 3,408 | Mean 72–76 (by ascending 25OHD category) | 60.1 | Good | Median 7.3 |
Hutchinson [31] | 2010 | Norway | Prospective cohort | Men and women over age of 25 living in city of Tromso | Smokers – 2,410 Non-smokers – 4,751 | Smokers – mean 57–58 (by ascending 25OHD quartile). | 78 | Good | Mean Smokers – 11.4 Non-smokers 11.8 |
Non-smokers mean 59–61 (by ascending 25OHD quartile) | |||||||||
Jia [32] | 2007 | UK | Prospective cohort | Men and women over age of 75 living in city of Aberdeen | 398 | Median 80 | Men 25 Women 17 | Fair | Median 5.95 |
Johansson [33] | 2011 | Sweden | Prospective cohort | Men aged 70–81 years living in cities of Gothenburg, Malmo and Uppsala | 3,014 | Mean 75 | 45 | Fair | 6 |
Melamed [34] | 2008 | USA | Prospective cohort | Men and women aged over 20 across USA | 13,331 | Mean 41.0-46.7 (by 25OHD quartile) | 67.7 | Excellent | Median 8.7 |
Michaelsson [35] | 2010 | Sweden | Prospective cohort | Men born during 1920–4 living in city of Uppsala | 1,194 | Mean 71 | 73 | Good | Median 12.7 |
Semba [36] | 2010 | Italy | Prospective cohort | Men and women over 65 living in Tuscany | 1,155 | Median 71–78 (by ascending 25OHD quartile) | 90.3 | Good | 6.5 |
Virtanen [37] | 2011 | Finland | Prospective cohort | Middle aged men and women in Eastern Finland | 1,136 | Mean 61–62 (by ascending 25OHD tertile) | Men – 85.6 Women – 78.4 | Good | 9.1 |
Visser [38] | 2006 | Netherlands | Prospective cohort | Men and women aged over 65 living in city of Amsterdam | 1,260 | No average given, all over 65, recalculated as mean 70.2-78.5 by category | 81.7 | Good | 6 |