Table 2.
Prevalence of thyroid dysfunctionsb,c.
| BMI (Kg/m2) | Total | Overt hypothyroidism (%) |
Subclinical hypothyroidism (%) |
Isolated hypothyroxinemia (%) |
TPOAb positive (%) |
TgAb positive (%) |
|---|---|---|---|---|---|---|
| Total | 6303 | 63 (1.0) | 203 (3.2) | 149 (2.4) | 578 (9.2) | 790 (12.5) |
| <18.5 | 870 | 2 (0.2) | 29 (3.3) | 11 (1.3) | 58 (6.7) | 94 (10.8) |
| 18.5–24.9 | 4547 | 42 (0.9) | 141 (3.1) | 87 (1.9) | 402 (8.8) | 564 (12.4) |
| 25.0–29.9 | 796 | 16 (2.0) | 26 (3.3) | 40 (5.0) | 97 (12.2) | 114 (14.3) |
| ≥30.0 | 90 | 3 (3.3) | 7 (7.8) | 11 (12.2) | 21 (23.3) | 18 (20.0) |
| P value | <0.001 | 0.101 | <0.001 | <0.001 | 0.025 | |
| P t valuea | <0.001 | 0.340 | <0.001 | <0.001 | 0.004 |
a P value for trend.
b P < 0.05 was considered as a significant difference.
cThe diagnostic standards for thyroid abnormalities were according to the pregnant specific reference ranges of the 4th–8th gestational weeks.