Table 1: Clinical and laboratory characteristics of the participants.

CharacteristicsMale ( )Female ( )Total ( )

Age (years)59.22 ± 9.0359.04 ± 8.2059.11 ± 8.53
BMI (kg/m2)24.93 ± 3.3824.66 ± 3.3624.76 ± 3.37
Serum 25 (OH)D (nmol/L)47.50 (38.00–59.00)42.90 (35.15–53.11)*44.68 (36.20–55.30)
Serum FT3 (pmol/L)4.34 (3.99–4.69)4.31 (3.98–4.72)4.32 (3.98–4.69)
Serum FT4 (pmol/L)15.87 (13.10–18.03)15.81 (13.22–17.95)15.83 (13.18–17.97)
Serum TSH (μIU/mL)2.06 (1.36–3.30)3.03 (1.89–4.60)*2.65 (1.62–4.10)
Serum TPOAb (IU/mL)3.09 (1.07–11.08)4.18 (1.24–16.28)3.66 (1.15–14.34)
Serum TgAb (IU/mL)10.08 (6.87–19.22)13.19 (7.90–35.66)*12.06 (7.31–27.00)
Thyroid volume (mL)8.44 (6.82–10.06)7.24 (5.83–8.82)7.74 (6.16–9.40)
Presence of thyroid nodule(s) (n (%))174 (31.02%)339 (39.28%)*513 (36.03%)
Current smokers (n (%))252 (44.92%)16 (1.85%)*268 (18.82%)

Significantly different from males, P < 0.01.