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Results of subgroup analysis.
| Parameter | Category | No.of study | OR (95%CI) | I² | P |
|---|---|---|---|---|---|
| TSH≥3mIU/L | Yes | 14 | 1.67 (1.17-2.37) | 70.10% | 0.004 |
| No | 9 | 1.33 (0.97-1.84) | 57.00% | 0.077 | |
| TSH≥4mIU/L | Yes | 9 | 1.69 (1.02-2.81) | 74.90% | 0.004 |
| No | 17 | 1.45 (1.12-1.86) | 57.70% | 0.043 | |
| Pregnancy period | first trimester | 10 | 1.79 (1.04-3.07) | 77.60% | 0.034 |
| second and third trimester | 6 | 1.70 (1.05-2.75) | 48.40% | 0.030 |
