Table 2 Risk factors of subclinical hypothyroidism among total subjects, subjects with positive thyroid autoantibodies, and subjects with negative autoantibodies

 Sex

1.540 (1.106,2.144)

0.011

1.790 (0.847,3.780)

0.127

1.170 (0.791,1.730)

0.431

 Age

1.290 (0.839,1.981)

0.246

1.904 (0.489,2.445)

0.827

1.413 (0.846,2.360)

0.186

 Smoking

0.250 (0.135,0.464)

< 0.001

0.391 (0.118,1.300)

0.126

0.253 (0.122,0.525)

< 0.001

 Obesity

1.552 (1.007,2.390)

0.046

2.176 (1.090,4.344)

0.027

1.206 (0.676,2.153)

0.526

 Diabete mellitus

0.973 (0.502,1.887)

0.936

3.316 (0.437,25.132)

0.246

0.694 (0.342,1.407)

0.311

 Hypertension

0.950 (0.664,1.358)

0.778

0.967 (0.509,1.839)

0.919

0.936 (0.604,1.450)

0.766

 Urinary iodine concentration

1.001 (1.000,1.001)

0.061

1.000 (0.999,1.002)

0.398

1.001 (1.000,1.001)

0.094

 TPO-Ab

3.187 (2.195,4.628)

< 0.001

–

–

–

–

 Tg-Ab

3.206 (2.262,4.542)

< 0.001

–

–

–

–

 Sex

0.820 (0.567,1.185)

0.291

1.857 (0.872,3.958)

0.109

–

–

 Age

1.277 (0.823,1.982)

0.275

1.155 (0.509,2.621)

0.730

–

–

 Smoking

0.248 (0.127,0.482)

< 0.001

–

–

–

–

 Obesity

1.542 (0.988,2.407)

0.057

2.212 (1.103,4.433)

0.025

–

–

 TPO-Ab

1.924 (1.190,3.110)

0.008

–

–

–

–

 Tg-Ab

2.053 (1.303,3.236)

0.002

–

–

–

–