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Fig. 9-6. Relationship between the optimal daily dose of levothyroxine sodium and the mean pretreatment serum TSH concentration in patients with primary hypothyroidism. Simple linear regressions are shown for two subgroups calculated according to the daily dose of L-T4 divided at the median dose of 125 µg; the intercept of these two correlation lines occurs at the TSH concentration of 36 mU/l. (Reproduced with permission)(6). |