Vitamin D Status And Related Factors In College Students In North Anhui

Objective: The purpose of this study was to determine vitamin D status in adolescent in North Anhui and examine factors that independently related vitamin D status.Methods: In April 2015,a total of 339 adolescent were selected from six classes in a college in Fuyang,one of the largest cities in North Anhui located at 32.9 degrees north latitude.Concentrations of 25(OH)D in finger-tip blood was measured by using LC-MS/MS,and questionnaires were used to collect information on related factors.Results: The mean25(OH)D level was 16.0 nmol/L(SD = 5.4),ranged from 6.2 to 34.5.The proportionof 25(OH)D < 25 nmol/L was 94.7% in the research object.Univariate analysis indicated that the concentration of 25(OH)D was higher in adolescent with younger,female,non-only child,longer duration of sun exposure,outdoor activities more than 30 minutes between 11 am and 15 pm in a nearly week,light-skin and non-drinking.However,there was no significant association between intake frequencies of vitamin D-rich food and 25(OH)Dlevel.In a multiple linear regression model,25(OH)D levels significantly decrease with the increase of the age(?=-0.62,95% Cl:-1.04,-0.20);25(OH)D level of girls were significant higher than boys(?=2.31,95% Cl:0.96,3.66);and25(OH)D level was significantly elevate with the increase of sun exposure frequency(?=0.99,95% CI: 0.13,1.85)and outdoor activity time between 11 am and 15 pm(?=0.93,95% CI: 0.27,1.58).Conclusions: Vitamin D deficiency among adolescent in North Anhui is common.More frequencies of sun exposure and increasing time of outdoor activitymight significantly improve vitamin D levels,rather than more vitamin D rich food.