Objective To determine the level of serum 25-hydroxyvitamin D （25（OH）D） and its association with thyroid autoantibodies and thyroid nodules in adult women for health examination in Shanghai.
Methods We recruited a total of 2 108 healthy women for examination in the hospital. According to the serum 25-hydroxyvitamin D， the women were classified into four groups： 25（OH）D≥30 μg·L-1 as sufficient group， 20 μg·L-1≤25（OH）D<30 μg·L-1 as insufficient group， 10 μg·L-1≤25（OH）D<20 μg·L-1 as the deficiency group， and<10 μg·L-1 as severe deficiency group. The association was determined between the serum 25（OH）D and thyroid autoantibodies and thyroid nodules.
Results The prevalence of deficiency in adult women was determined to be 69.31%. Alkaline phosphatase （ALP）， low-density lipoprotein （LDL）， anti-thyroglobulin antibodies （TGAB） and anti-thyroid peroxidase autoantibody （TPOAB） levels significantly differed between the severe deficiency group and sufficient group （each P<0.05）. Moreover， prevalence of thyroid nodules， TGAB， TGAB and/or TPOAB differed significantly across the four groups （each P<0.05）.Logistic regression analysis showed that decrease of serum 25（OH）D was significantly associated with age and increasing prevalence of thyroid nodules， TGAB， TGAB and/or TPOAB.
Conclusion Vitamin D deficiency remains high in adult women for health examination in Shanghai. Serum 25（OH）D insufficiency or deficiency is associated with age， thyroid autoantibodies and thyroid nodules.
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