Fatty fish and supplements are the greatest modifiable contributors to the serum 25-hydroxyvitamin D concentration in a multiethnic population.
OBJECTIVE
Because vitamin D synthesis is lower in a heavily pigmented skin than in a lighter skin, the relative contribution of determinants to the vitamin D concentration might differ between ethnic groups. The aim of this study was to assess the prevalence of vitamin D deficiency and the relative contribution of vitamin D consumption and exposure to sunlight to the vitamin D concentration in a multiethnic population.


METHODS
Cross-sectional study.


METHODS
A total of 613 adults aged 18-65 years from a random sample from general practices in the Netherlands (52 degrees N, 2003-05), stratified according to gender and ethnic group.


METHODS
Serum 25-hydroxyvitamin D [25(OH)D], PTH, ethnic group, sunlight exposure, consumption of foods and supplements rich in vitamin D.


RESULTS
The prevalence (95% confidence interval) of vitamin D deficiency [serum 25(OH)D < 25 nmol/l] was higher in Turkish (41.3%; 32.5-50.1), Moroccan (36.5%; 26.9-46.1), Surinam South Asian (51.4%; 41.9-60.9), Surinam Creole (45.3%; 34.0-56.6), sub-Saharan African (19.3%; 9.1-29.5) and other adults (29.1%; 17.1-41.1) compared to the indigenous Dutch (5.9%; 1.3-10.5). Modifiable, significant determinants (standardized regression coefficients) for serum 25(OH)D concentration were: consumption of fatty fish (0.160), use of vitamin D supplements (0.142), area of uncovered skin (highest category 0.136; middle category 0.028), use of tanning bed (0.103), consumption of margarine (0.093) and preference for sun (0.089). We found no significant modification of ethnic group on the effect of sunlight determinants.


CONCLUSIONS
Of the modifiable determinants, fatty fish and supplements are the greatest contributors to the serum 25(OH)D concentration in a multiethnic population.
van der Meer
Irene M
IM
Department of Epidemiology, Municipal Health Service of The Hague, The Hague, The Netherlands. i.vandermeer@ocw.denhaag.nl
Boeke
A Joan P
AJ
Lips
Paul
P
Grootjans-Geerts
Ilse
I
Wuister
Jan D
JD
Devillé
Walter L J M
WL
Wielders
Jos P M
JP
Bouter
Lex M
LM
Middelkoop
Barend J C
BJ
D000328:Adult; D000368:Aged; D000818:Animals; D003430:Cross-Sectional Studies; D004032:Diet; D019587:Dietary Supplements; D005260:Female; D005396:Fish Products / Q000032:analysis*; D006801:Humans; D006887:Hydroxycholecalciferols / Q000008:administration & dosage / Q000097:blood*; D008297:Male; D008875:Middle Aged; D009426:Netherlands / Q000208:ethnology; D013472:Sunlight; D011795:Surveys and Questionnaires; D014808:Vitamin D Deficiency / Q000097:blood / Q000188:drug therapy* / Q000208:ethnology*; D055815:Young Adult
D006887:Hydroxycholecalciferols