Bone Abstracts

Objective: To analyse the influential factors of lifestyle on vitamin D status among aged people in Shanghai community.

Method: Lifestyles of 3846 elderly men and women aged over 65 years were investigated using a self-designed questionnaire from ten communities of urban and suburb in Shanghai China, which contained sociodemographic factors and lifestyle factors and so on. The levels of serum 25(OH)D were measured by Cobas Diagnosis System of Roche. Univariate analysis was used to select the impactor factors on 25(OH)D levels at first, and then these factors were tested by logistic multiply regression to eliminate the interaction, and finally found the significantly important factors.

Results: The prevalence of vitamin D deficiency was 44.02% and insufficiency was 38.35% in our study cohort. Serum 25(OH)D levels showed a relatively skewed distribution (median 22.73 ng/ml and mean 24.1 ng/ml for men; and median 19.99 ng/ml and mean 21.0 ng/ml for women). Logistic multiple regression showed that education levels, outdoor physical activities, calcium and vitamin D supplements and residence were statistically significant (P<0.05) on 25(OH)D level of elderly men, while drinking milk or not, calcium and vitamin D supplement, BMI and residence were statistically significant on 25(OH)D level of elderly women. To old men,physical activity (≥30 min/day) was protective factor while uneducated (less than primary education) was risk factor, and to old women,milk consumption (≥250 ml/day) was protective factor while BMI>26.06 kg/m² was risk factor, however, calcium supplements and suburban residence were protective factors for both men and women.

Conclusions: Serum 25(OH)D concentration was closely related to lifestyle of aged people in community. Calcium and vitamin D supplements, suburban residence were protective factors, and drinking milk and outdoor physical activities improved serum 25(OH)D levels. Scientific lifestyle is essential for aged people to improve the health-related quality of life.