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| Parameter | Pearson correlation (r) | p-value |
| OPN vs. TSH | −0.52 | <0.001 |
| OPN vs. fT3 | 0.62 | <0.001 |
| OPN vs. fT4 | 0.75 | <0.001 |
TSH = Thyroid stimulating hormone, fT3 = Free tri-iodothyronine, fT4 = Free thyroxine, OPN = Osteopontin.
