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Meta-analysis of the secondary outcome indicators.
| Outcome indicator | The included studies | MD | 95%CI | P 1 | I2% | P 2 |
| Diameter of thyroid nodule | 4,6,7,8,9,11 | –0.43 | (–0.63,–0.22) | .00 | 84 | .00 |
| FT3 | 4,6,7,8,11 | –1.99 | (–3.14,–0.85) | .00 | 99 | .00 |
| FT4 | 4,6,7,8,11 | –3.20 | (–5.50,–0.89) | .00 | 98 | .00 |
