Table 2: Comparison of clinical and laboratory characteristics based on vitamin D insufficiency.

Vitamin D insufficiency (1368) Nonvitamin D insufficiency (56)P value

Age (years)59.07 ± 8.5560.07 ± 8.110.371
Male sex (n (%))529 (38.67%)32 (57.14%)0.006
BMI (kg/m2)24.79 ± 3.4024.21 ± 2.500.106
Serum FT3 (pmol/L)4.39 (3.97–4.69)4.48 (4.18–4.75)0.094
Serum FT4 (pmol/L)15.51 (13.14–17.93)16.29 (14.01–18.79)0.092
Serum TSH (μIU/mL)3.42 (1.62–4.18)2.47 (1.54–3.24)0.000
Serum TgAb (IU/mL)84.26 (7.26–27.77)21.12 (8.38–22.40)0.000
Serum TPOAb (IU/mL)40.45 (1.17–14.33)16.77 (0.99–14.99)0.000
Thyroid volume (mL)8.43 (6.12–9.35)8.71 (6.53–10.62)0.476
Presence of thyroid nodule(s) (n (%))495 (36.18%)18 (32.14%)0.537
Current smokers (n (%))814 (59.50%)37 (66.07%)0.326