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Relationship between FT4 and TSH for all hypothyroid patients (spontaneous and iatrogenic causes combined) according to age. For all patients together, the Spearman correlation coefficient = −0.681, P value <0.0001. Most of the values for the group with iatrogenic hypothyroidism fall within the outlined circle. The inset shows the slopes within the four age groups: dots and dashes, under 35 yr; dashes, 35–49 yr; dots, 50–64 yr; solid line, over 64 yr.
