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Figure 1 Incident HF Events According to TSH Levels
Participants with TSH  10.0 to 19.9 mU/l who were untreated by thyroxine replacement (participants censored at the time of first thyroxine use) had a greater incidence of HF events compared with euthyroid participants (41.7 vs. 22.9 per 1,000 person-years, p = 0.01), but rates were similar for those with subclinical hyperthyroidism or those with TSH between 4.5 and 9.9 mU/l. HF = heart failure; TSH = thyroid-stimulating hormone.
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