Association between serum 25-hydroxyvitamin D and psychological health in older Chinese men in a cohort study.
BACKGROUND
Few studies evaluated the association between vitamin D and psychological health in Chinese. This study examined these associations in Chinese older men in Hong Kong.


METHODS
Baseline serum 25-hydroxyvitamin D (25OHD), depression and cognitive function were assessed in 939 community-dwelling Chinese men aged >65. Data on depression status at 4-year follow up was available in 629 men. Data were collected for confounding factors: demographics, number of diseases, smoking, alcohol use, body mass index, physical activity, mobility limitations, dietary intake, season of blood measurement, and serum parathyroid hormone level. Multivariate logistic regression analyses were performed with adjustments for confounding factors.


RESULTS
An inverse association between serum 25OHD and baseline depression was observed. Men in the highest (>=92 nmol/L) compared with lowest (<=63 nmol/L) quartile of serum 25OHD had an adjusted odds ratio for depression of 0.46 (95% CI: 0.22-0.98, P(trend)=0.004). The association was more pronounced in low vitamin D season than in high vitamin D season. No association was observed between serum 25OHD and incident depression at 4 years. Baseline cognitive impairment was not associated with serum 25OHD in all models.


CONCLUSIONS
Self-reported measure of depression and cognitive performance, the small number of incident depression at 4-year follow up and selection bias may affect the study validity.


CONCLUSIONS
Serum 25OHD was inversely associated with depression at baseline and was not linked to baseline cognitive impairment and 4-year incident depression in Chinese older men. Future studies are warranted to evaluate these associations in populations with higher prevalence of vitamin D deficiency.
Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong SAR. ruthchansm@cuhk.edu.hk
Ruth
R
Chan
Dicken
D
Chan
Jean
J
Woo
Claes
C
Ohlsson
Dan
D
Mellström
Timothy
T
Kwok
Pingchung
P
Leung
D000368:Aged; D000428:Alcohol Drinking / Q000523:psychology; D016009:Chi-Square Distribution; D002681:China / Q000208:ethnology; D003072:Cognition Disorders / Q000097:blood*; D015331:Cohort Studies; D003866:Depressive Disorder / Q000097:blood*; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D016015:Logistic Models; D008297:Male; D008603:Mental Health; D009483:Neuropsychological Tests; D010281:Parathyroid Hormone / Q000097:blood; D012907:Smoking / Q000523:psychology; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood; D014808:Vitamin D Deficiency / Q000503:physiopathology / Q000523:psychology; D014815:Vitamins / Q000097:blood*
D010281:Parathyroid Hormone; D014815:Vitamins; D014807:Vitamin D; C104450:25-hydroxyvitamin D