In the Original Investigation by Roos et al titled “The Starting Dose of Levothyroxine in Primary Hypothyroidism Treatment,” published in the August 8/22 issue of the ARCHIVES (2005;165:1714-1720), there were errors in Figure 1 and in the text. In Figure 1, the lower row on the bottom should have read “Low Dose” instead of “Full Dose.” In the second paragraph of the “Safety” subsection, the first sentence should have read “At baseline, sinus bradycardia was observed in 40% of patients in the full-dose group and 28% in the low-dose group.”